CN113938152B

CN113938152B - Radio frequency system and communication equipment

Info

Publication number: CN113938152B
Application number: CN202111449143.7A
Authority: CN
Inventors: 陈锋; 仝林
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-12-13
Anticipated expiration: 2041-11-30
Also published as: WO2023098111A1; CN113938152A

Abstract

The application relates to a radio frequency system and a communication device. The radio frequency system includes: the radio frequency transceiver module is used for supporting the transmission and the main set reception of low-frequency signals and supporting the MIMO reception of the low-frequency signals; the radio frequency receiving module is used for supporting diversity reception of low-frequency signals and MIMO reception of the low-frequency signals, so that the radio frequency system can support 4 x 4MIMO reception of the low-frequency signals, and the throughput of the low-frequency signals can be improved in multiples under the condition that frequency spectrum resources and antenna transmitting power are not increased; when the radio frequency system is applied to communication equipment, the download rate can be improved so as to improve the experience of users, and meanwhile, when the communication equipment is positioned in weak signal environments such as cell edges, deep buildings and elevators, the diversity gain is higher and the coverage range is larger through 4 x 4MIMO reception, so that the receiving performance is better.

Description

Radio frequency system and communication equipment

Technical Field

The present application relates to the field of antenna technologies, and in particular, to a radio frequency system and a communication device.

Background

With the development and progress of the technology, mobile communication technology is gradually beginning to be applied to communication devices such as mobile phones and the like. With the development and advancement of technologies, 5G mobile communication technologies are gradually beginning to be applied to electronic devices. The 5G mobile communication technology communication frequency is higher than that of the 4G mobile communication technology. The conventional radio frequency system has poor receiving performance for receiving 5G low-frequency signals (for example, N28 frequency band signals) in poor signal areas such as cell edges, building depths or elevators.

Disclosure of Invention

The embodiment of the application provides a radio frequency system and communication equipment, which can realize 4 x 4MIMO reception and have better receiving performance.

A radio frequency system, comprising:

a radio frequency transceiver;

a radio frequency transceiver module configured with an input port, an output port, a first antenna port and a second antenna port, the input port and the output port being respectively configured to connect to the radio frequency transceiver, the first antenna port being configured to connect to a first antenna, the second antenna port being configured to connect to a third antenna, the radio frequency transceiver module being configured to support transmission and main set reception of low frequency signals through the first antenna port and support MIMO reception of the low frequency signals through the second antenna port;

a radio frequency receiving module connected with the radio frequency transceiver and configured with a third antenna port and a fourth antenna port, the third antenna port being configured to connect with a second antenna, the fourth antenna port being configured to connect with a fourth antenna, the radio frequency receiving module being configured to support diversity reception of the low frequency signals through the third antenna port and support MIMO reception of the low frequency signals through the fourth antenna port;

the first filter module, two first ends of first filter module respectively one-to-one connect the input port output port, the second end of first filter module is connected first antenna port for the filtering stray wave outside the low frequency signal.

A communication device comprising a radio frequency system as described above.

The radio frequency system comprises a radio frequency transceiver, a radio frequency transceiver module, a radio frequency receiving module and a first filtering module, wherein the radio frequency transceiver module is used for supporting the transmission and the main set reception of low-frequency signals and the MIMO reception of the low-frequency signals; the radio frequency receiving module is used for supporting diversity reception of the low-frequency signals and MIMO reception of the low-frequency signals, so that the radio frequency system can realize 4 x 4MIMO reception of the low-frequency-band radio frequency signals, and the throughput of the low-frequency signals can be improved in multiples under the condition of not increasing frequency spectrum resources and antenna transmitting power; when the radio frequency system is applied to communication equipment, the download rate can be improved so as to improve the experience of users, and meanwhile, when the communication equipment is positioned in weak signal environments such as cell edges, deep buildings and elevators, the diversity gain is higher, the coverage area is larger, and the receiving performance is better. Compared with a radio frequency system supporting low-frequency signal 2 x 2MIMO receiving in the related art, the radio frequency system provided by the embodiment of the application has the advantages that the downlink communication speed and the coverage distance are doubled, and the receiving performance of the radio frequency system on the low-frequency signal can be further improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a diagram illustrating an exemplary RF system;

FIG. 2 is a second schematic diagram of an embodiment of an RF system;

FIG. 3 is a third exemplary diagram of an RF system;

FIG. 4 is a diagram illustrating an exemplary RF transceiver module;

fig. 5 is a second schematic structural diagram of an rf transceiver module according to an embodiment;

fig. 6 is a third schematic structural diagram of an rf transceiver module in an embodiment;

fig. 7 is a schematic structural diagram of an rf transceiver module according to an embodiment;

fig. 8 is a fourth schematic structural diagram of an rf transceiver module in an embodiment;

FIG. 9 is a fifth schematic diagram illustrating an exemplary RF transceiver module;

fig. 10 is a schematic structural diagram of an embodiment of an rf transceiver module;

FIG. 11 is a diagram illustrating an exemplary RF receiving module;

fig. 12 is a schematic diagram illustrating a specific structure of an rf receiving module according to an embodiment;

fig. 13 is a second exemplary schematic structural diagram of an rf receiving module according to an embodiment;

fig. 14 is a schematic configuration diagram of a communication device in one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first client may be referred to as a second client, and similarly, a second client may be referred to as a first client, without departing from the scope of the present application. Both the first client and the second client are clients, but they are not the same client.

The radio frequency system according to the embodiment of the present application may be applied to a communication device having a wireless communication function, where the communication device may be a handheld device, a vehicle-mounted device, a wearable device, a computing device or other processing devices connected to a wireless modem, and various forms of User Equipment (UE) (e.g., a Mobile phone), a Mobile Station (MS), and the like. For convenience of description, the above-mentioned devices are collectively referred to as a communication device.

As shown in fig. 1, in one embodiment, a radio frequency system provided in the embodiment of the present application includes: the radio frequency transceiver 10, the radio frequency transceiver module 20, the radio frequency receiving module 30, and a first filtering module (the first filtering module is not shown in fig. 1); the antenna further comprises a first antenna ANT1, a second antenna ANT2, a third antenna ANT3 and a fourth antenna ANT4.

In this embodiment, the first antenna ANT1, the second antenna ANT2, the third antenna ANT3, and the fourth antenna ANT4 are all capable of supporting the transceiving of the radio frequency signals of the NR low frequency multiple frequency bands. Each branch antenna may be formed using any suitable type of antenna. For example, each branch antenna may include an antenna with a resonating element formed from the following antenna structure: at least one of an array antenna structure, a loop antenna structure, a patch antenna structure, a slot antenna structure, a helical antenna structure, a strip antenna, a monopole antenna, a dipole antenna, and the like. Different types of antennas may be used for different frequency bands and frequency band combinations. In the embodiment of the present application, the types of the first antenna ANT1, the second antenna ANT2, the third antenna ANT3, and the fourth antenna ANT4 are not further limited.

In the present embodiment, the rf transceiver 10 may be configured with a plurality of ports to realize the connection with the rf transceiving module 20 and the rf receiving module 30. Optionally, the rf transceiver 10 includes a transmitter and a receiver, wherein the transmitter is configured to transmit an rf signal to the rf transceiver module 20, and the receiver is configured to receive the rf signals output by the rf transceiver module 20 and the rf receiving module 30.

IN the present embodiment, the rf transceiver module 20 is configured with an input port PA IN, an output port LNA OUT, a first antenna port LB ANT1, and a second antenna port LB ANT2, the input port PAIN and the output port LNA OUT are respectively configured to be connected to the rf transceiver 10, the first antenna port LB ANT1 is configured to be connected to the first antenna ANT1, the second antenna port LB ANT2 is configured to be connected to the third antenna ANT3, and the rf transceiver module 20 is configured to support transmission and main-set reception of low-frequency signals through the first antenna port LB ANT1, and support MIMO reception of low-frequency signals through the second antenna port LB ANT2.

The MIMO (Multiple Input Multiple Output, multiple transmission and Multiple reception) technology is to use Multiple transmitting antennas and Multiple receiving antennas at a transmitting port and a receiving port, respectively, to fully utilize space resources, and implement Multiple transmission and Multiple reception through Multiple antennas, so as to improve the channel capacity of the system by Multiple times without increasing spectrum resources and antenna transmitting power.

The rf transceiver module 20 is configured to support transmission and main set reception of a plurality of low frequency signals through the first antenna port LB ANT1, and support main set MIMO reception of a plurality of low frequency signals through the second antenna port LB ANT2. Specifically, an input port PA IN of the radio frequency transceiver module 20 is connected to the radio frequency transceiver 10, an output port LNA OUT1 of the radio frequency transceiver module 20 is connected to the radio frequency transceiver 10, and the radio frequency transceiver module 20 is configured to perform filtering and amplification processing on a low-frequency signal sent by the radio frequency transceiver 10, output the low-frequency signal to a first antenna port LB ANT1, and transmit the low-frequency signal through the first antenna ANT1, so as to implement transmission control on the low-frequency signal; the antenna is further configured to receive a low-frequency signal received by the first antenna ANT1 through the first antenna port LB ANT1 and receive a low-frequency signal received by the third antenna ANT3 through the second antenna port LB ANT2, and after filtering and amplifying the low-frequency signal, the low-frequency signal is output to the radio frequency transceiver 10 through the output port LNA OUT to implement reception control of the low-frequency signal. Alternatively, the rf transceiver module 20 may be understood as a Low frequency Power Amplifier module (LB L-PA Mid, low Band Power Amplifier Modules) with a built-in Low noise Amplifier.

Optionally, the radio frequency transceiver module 20 is further configured to implement receiving switching control, transmitting switching control, and switching control between transmitting and receiving for a plurality of low frequency signals. Specifically, one of the plurality of low frequency signals may be selected for transmission and dominant set reception through the first antenna port LB ANT1, and one of the plurality of low frequency signals may be selected for dominant set MIMO reception through the second antenna port LB ANT2. Optionally, the radio frequency transceiver module 20 may simultaneously perform transmission and dominant set reception on the low frequency signals of more than two frequency bands through the first antenna port LB ANT1, and perform dominant set MIMO reception on the low frequency signals of more than two frequency bands through the second antenna port LB ANT2.

The low-frequency signal may include a 5G low-frequency signal and/or a 4G low-frequency signal. Optionally, the low frequency signal includes at least one of N5, N8, N20, N28, N71 frequency bands. Optionally, the low frequency signal may further include at least one of B5, B8, B20, B28, B71 frequency bands. Wherein, the 5G low-frequency signals and the 4G low-frequency signals with the same frequency band can share the same transmitting path and receiving path.

In the present embodiment, the rf receiving module 30, connected to the rf transceiver 10, is configured with a third antenna port LB ANT3 and a fourth antenna port LB ANT4, the third antenna port LB ANT3 is configured to be connected to the second antenna ANT2, the fourth antenna port LB ANT4 is configured to be connected to the fourth antenna ANT4, and the rf receiving module 30 is configured to support diversity reception of low frequency signals through the third antenna port LB ANT3 and MIMO reception of low frequency signals through the fourth antenna port LB ANT4.

The rf receiving module 30 is configured to support diversity reception of multiple low frequency signals through a third antenna port LB ANT3, and support diversity MIMO reception of multiple low frequency signals through a fourth antenna port LB ANT4. Specifically, the output port LNA OUT of the rf receiving module 30 is connected to the rf transceiver 10, the rf receiving module 30 receives the low-frequency signal received by the second antenna ANT2 through the third antenna port LB ANT3 and receives the low-frequency signal received by the fourth antenna ANT4 through the fourth antenna port LB ANT4, and after performing filtering and amplifying processing on the low-frequency signal, the low-frequency signal is output to the rf transceiver 10 through the output port LNA OUT of the rf receiving module 30, so as to implement receiving control on the low-frequency signal. Alternatively, the rf receiving module 30 may be understood as a Low Noise AmPlifier module (LFEM), which may specifically include a Low Noise AmPlifier and a plurality of filters, and the like, and may be configured to support receiving processing of Low frequency signals.

Alternatively, the rf receiving module 30 may select one of the multiple low frequency signals through the third antenna port LB ANT3 for diversity reception, and select one of the multiple low frequency signals through the fourth antenna port LB ANT4 for diversity MIMO reception. Optionally, the radio frequency receiving module 30 may perform diversity reception on the low frequency signals of more than two frequency bands simultaneously through the third antenna port LB ANT3, and perform diversity MIMO reception on the low frequency signals of more than two frequency bands through the fourth antenna port LB ANT4.

IN this embodiment, two first ends of the first filtering module are respectively connected to the input port PA IN and the output port LNA OUT IN a one-to-one correspondence manner, and a second end of the first filtering module is connected to the first antenna port LB ANT1 for filtering OUT stray waves other than low-frequency signals.

The first filtering module may be disposed outside the rf transceiver module 20, or may be integrated inside the rf transceiver module 20, and is configured to filter a low-frequency signal of a transmit path between the input port PA IN of the rf transceiver module 20 and the first antenna port LB ANT1, so as to filter stray waves other than the low-frequency signal; and is further configured to perform filtering processing on a low-frequency signal of a receiving path between the output port LNA OUT of the radio frequency transceiver module 20 and the first antenna port LB ANT1, so as to filter OUT a stray wave other than the low-frequency signal. Specifically, the first filtering module performs filtering processing on the low-frequency signal, which is received by the input port PA IN and amplified by the radio frequency transceiver module 20, so as to output the low-frequency signal, which is subjected to power amplification and filtering processing, to the first antenna port LB ANT1; the first filtering module performs filtering processing on the low-frequency signal received by the first antenna port LB ANT1, and the low-frequency signal after filtering processing is amplified by the radio frequency transceiver module 20 and then output to the output port LNA OUT, so as to output to the radio frequency transceiver 10.

The first filtering module may include a duplexer or a filter, and when the low-frequency signal is a radio-frequency signal of a single low-frequency band, for example, an N28 frequency band signal, the second filtering module may perform filtering processing on the stray waves outside the N28 frequency band; when the low-frequency signal is a radio-frequency signal of a plurality of low-frequency bands, a plurality of first filtering modules may be provided or the first filtering module may include a plurality of duplexers or filters, so as to perform filtering processing on each low-frequency signal. When the first filtering module comprises a duplexer, two first ends of the duplexer are respectively connected with an input port PA IN and an output port LNA OUT IN a one-to-one correspondence manner, and a second end of the duplexer is connected with a first antenna port LB ANT1; when the first filtering module includes a filter, the first filtering module may include two filters and a switch device, the first ends of the two filters are respectively connected to the two first ends of the switch device, the second ends of the two filters are respectively connected to the input port PA IN and the output port LNA OUT IN a one-to-one correspondence, and the second end of the switch device is connected to the first antenna port LB ANT1.

In the radio frequency system provided by this embodiment, the radio frequency transceiver module 20 can support the transmission and the main set reception of the low frequency signals and support the MIMO reception of the low frequency signals by the radio frequency transceiver module 20; the radio frequency receiving module 30 can support diversity reception of low frequency signals and MIMO reception of low frequency signals, so that the radio frequency system can realize 4 x 4MIMO reception of low frequency band radio frequency signals, and the throughput of the low frequency signals can be doubled without increasing spectrum resources and antenna transmitting power; when the radio frequency system is applied to communication equipment, the download rate can be improved so as to improve the experience of users, and meanwhile, when the communication equipment is positioned in weak signal environments such as cell edges, deep buildings and elevators, the 4 x 4MIMO receiving mode is adopted, so that higher diversity gain and larger coverage distance are achieved. Compared with a radio frequency system supporting low-frequency signal 2 x 2MIMO receiving in the related art, the radio frequency system provided by the embodiment of the application has the advantages that the downlink communication speed and the coverage distance are doubled, and the receiving performance of the radio frequency system on the low-frequency signal can be further improved.

As shown in fig. 2, in one embodiment, the radio frequency system further includes:

and the second filtering module 40 is connected to the second antenna port LB ANT2 and the third antenna ANT3, respectively, and is configured to perform filtering processing on the low-frequency signal received by the third antenna ANT 3.

The second filtering module 40 is configured to perform filtering processing on the low-frequency signal received by the third antenna ANT3 and selectively output a 5G low-frequency signal of at least one frequency band to the second antenna port LB ANT2, and the radio frequency transceiver module 20 performs low-noise amplification processing on the received low-frequency signal through the second antenna port LB ANT2 and outputs the low-frequency signal to the radio frequency transceiver 10. Optionally, the second filtering module 40 is a filter, an input end of the filter is connected to the third antenna ANT3, and an output end of the filter is connected to the second antenna port LB ANT2.

the third filtering module 50 is connected to the fourth antenna port LB ANT4 and the fourth antenna ANT4, respectively, and configured to perform filtering processing on the low-frequency signal received by the fourth antenna ANT4.

The third filtering module 50 is configured to perform filtering processing on a low-frequency signal received by the fourth antenna ANT4 and selectively output a 5G low-frequency signal of at least one frequency band to the fourth antenna port LB ANT4, and the radio frequency receiving module 30 performs low-noise amplification processing on the received low-frequency signal through the fourth antenna port LB ANT4 and outputs the low-frequency signal to the radio frequency transceiver 10. Optionally, the third filtering module 50 is a filter, an input end of the filter is connected to the fourth antenna ANT4, and an output end of the filter is connected to the fourth antenna port LB ANT4.

As shown in fig. 3, in one embodiment, the radio frequency system further comprises:

and the output end of the first amplification module 60 is connected with the second antenna port LB ANT2, and the input end of the first amplification module 60 is connected with the second filtering module 40, and is used for amplifying the low-frequency signal after filtering.

By arranging the first amplifying module 60 at a position outside the rf transceiver module 20 close to the third antenna ANT3, the receiving performance of the second antenna port LB ANT2 of the rf transceiver module 20 can be improved, and the problems of low efficiency caused by environmental problems and large insertion loss caused by a noise amplifying circuit far from the inside of the rf transceiver module 20 are avoided. Optionally, the first amplifying module 60 is a low noise amplifier, an input end of the low noise amplifier is connected to the second filtering module 40, and an output end of the low noise amplifier is connected to the second antenna port LB ANT2.

As shown in fig. 3, in one embodiment, the radio frequency system further includes:

and an output end of the second amplifying module 70 is connected to the fourth antenna port LB ANT4, and an input end of the second amplifying module 70 is connected to the third filtering module 50, and is configured to amplify the filtered low-frequency signal.

By arranging the second amplifying module 70 at a position outside the rf receiving module 30 close to the fourth antenna ANT4, the receiving performance of the fourth antenna port LB ANT4 of the rf transceiving module 20 can be improved, and the problems of low efficiency caused by environmental problems and large insertion loss caused by being far away from the internal noise amplifying circuit of the rf receiving module 30 are avoided. Optionally, the second amplifying module 70 is a low noise amplifier, an input end of the low noise amplifier is connected to the third filtering module 50, and an output end of the low noise amplifier is connected to the fourth antenna port LB ANT4.

In one embodiment, as shown in fig. 4, the first filtering module 200 is integrated inside the rf transceiver module 20, and the rf transceiver module 20 includes: a transmitting circuit 210, a switching circuit 220, and a first receiving circuit 230.

Two first ends of the first filtering module 200 are respectively connected to the transmitting circuit 210 and the first receiving circuit 230 in a one-to-one correspondence manner, a second end of the first filtering module 200 is connected to the switch circuit 220, and the first filtering module 200 is configured to filter a low-frequency signal transmitted by the transmitting circuit 210 and a low-frequency signal received by the first receiving circuit 230. The first filtering module 200 is integrated inside the rf transceiver module 20, which can reduce the main board area occupied by the rf system, improve the integration level of the device, facilitate the miniaturization of the device, and reduce the cost; meanwhile, the insertion loss of the receiving and transmitting link can be reduced, the output power of the radio frequency receiving and transmitting module 20 to the low-frequency signal is improved, the sensitivity performance of the low-frequency signal is improved, and further the communication performance of the radio frequency system can be improved.

Optionally, the low frequency signal comprises radio frequency signals of a plurality of low frequency bands; wherein: the number of the first filtering modules 200 is multiple, two first ends of each first filtering module 200 are respectively connected with the transmitting circuit 210 and the first receiving circuit 230 in a one-to-one correspondence manner, and a second end of each first filtering module 200 is connected with the switch circuit 220; the frequency band of the low frequency signal output by each first filtering module 200 is different. For example, the low frequency signals are signals of five different frequency bands N5, N8, N20, N28, and N71, five first filtering modules 200 may be correspondingly disposed to implement filtering processing on the four low frequency signals, and after the filtering processing of the five first filtering modules 200, the low frequency signals of the five frequency bands N5, N8, N20, N28, and N71 may be correspondingly output to the transmitting circuit 210 or the first receiving circuit 230.

The transmitting circuit 210 is connected to the input port PA IN of the rf transceiver module 20, and is configured to amplify the low-frequency signal received by the input port PA IN of the rf transceiver module 20, so as to output the amplified low-frequency signal to the first antenna port LB ANT1.

The switch circuit 220 is connected to the transmitting circuit 210, the first receiving circuit 230, and the first antenna port LB ANT1, respectively, and is configured to selectively turn on radio frequency paths between the transmitting circuit 210, the first receiving circuit 230, and the first antenna port LB ANT1. The switch circuit 220 may reduce the insertion loss of the rf transceiver module 20 through the switch circuit 220 for the transmit path and the receive path of the multiple low frequency signals, and further may boost the output power of the multiple low frequency signals at the first antenna port LB ANT1 and the output power at the output port LNAOUT. Optionally, the switch circuit 220 includes a multi-channel selection switch, and a plurality of first ends of the multi-channel selection switch are respectively correspondingly connected to the second ends of the plurality of first filtering modules 200 in a one-to-one correspondence; the second terminal of the multi-channel selection switch is connected to the first antenna port LB ANT1.

The first receiving circuit 230 is connected to the output ports (for example, two output ports are respectively an output port LNA OUT1 and an output port LNA OUT 2), the first antenna port LB ANT1, and the second antenna port LB ANT 2), and is configured to amplify the received low-frequency signal, so as to output the amplified low-frequency signal to the output port LNA OUT of the radio frequency transceiver module 20.

Optionally, as shown in fig. 4, the radio frequency transceiver module 20 further includes:

the coupling circuit 240 is connected to the switch circuit 220 and the first antenna port LB ANT1, respectively, and configured to couple low-frequency signals in a radio frequency path between the switch circuit 220 and the first antenna port LB ANT1.

Specifically, the radio frequency transceiver module 20 is further configured with a coupling output port CPLOUT, the coupling circuit 240 is respectively connected to the switch circuit 220, the first antenna port LB ANT1, and the coupling output port CPLOUT, and the low frequency signal in the radio frequency path between the switch circuit 220 and the first antenna port LB ANT1 is coupled to output the coupling signal through the coupling output port CPLOUT. More specifically, the coupling circuit 240 includes an input terminal, an output terminal, and a coupling terminal. The input terminal of the coupling circuit 240 is coupled to the switch circuit 220, the output terminal of the coupling circuit 240 is coupled to the first antenna port LB ANT1, and the coupling terminal is coupled to the coupling output port CPLOUT. The coupling signal comprises a forward coupling signal and a backward coupling signal, and the forward power information of the low-frequency band signal can be detected based on the forward coupling signal output by the coupling end; based on the reverse coupling signal output by the coupling terminal, the reverse power information of the low-frequency band signal can be correspondingly detected, and the detection mode is defined as a reverse power detection mode.

Optionally, as shown IN fig. 5, the radio frequency transceiver module 20 may also be configured with an input port GSM LB IN, an input port GSM HB IN, and a high frequency output port GSM HB OUT. The rf transceiver module 20 further includes a 2G low frequency transmitting circuit 250 and a 2G high frequency transmitting circuit 260. The 2G low frequency transmitting circuit 250 is connected to the first end of the switch circuit 220 and the input port GSM HB IN, respectively, and the 2G high frequency transmitting circuit 260 is connected to the input port GSM HB IN and the high frequency output port GSM HB OUT, respectively. The 2G low-frequency transmitting circuit 250 and the 2G high-frequency transmitting circuit 260 can respectively amplify the 2G low-frequency signal and the 2G high-frequency signal.

In one embodiment, as shown in fig. 6, the transmitting circuit 210 includes:

the input end of the first power amplifier 211 is connected with the input port PAIN; a first end of the first switch unit 212 is connected to the output end of the first power amplifier 211, and a plurality of second ends of the first switch unit 212 are respectively connected to the first ends of the plurality of first filtering modules 200 in a one-to-one correspondence manner (for example, two second ends of the first switch unit 212 are respectively connected to the first ends of two first filtering modules 200 in a one-to-one correspondence manner).

Specifically, when the frequency band of the low frequency signal is a preset frequency band, the first power amplifier 211 and the first filtering module 200 may support the related processing of the frequency band signal, so as to correspondingly output the low frequency signal without clutter; when the frequency band of the low frequency signal is a plurality of preset frequency bands, the plurality of second ends of the first switch unit 212 are respectively connected to the first ends of the plurality of first filtering modules 200 in a one-to-one correspondence manner, so that the first power amplifier 211 and the first filtering modules 200 can also support the related processing of the low frequency signals of a plurality of different frequency bands to correspondingly output the low frequency signals of each frequency band without clutter. It is understood that the input port PAIN of the radio frequency transceiver module 20, the first power amplifier 211, the first switching unit 212 and the plurality of first filtering modules 200 form a filtering path in a plurality of transmission paths, and the plurality of filtering paths are independent of each other and do not overlap with each other. It should be noted that, when the transmitting circuit 210 only needs to transmit a low-frequency signal in one frequency band, the number of the second terminals of the first switch unit 212 may be only one, and the number of the first filtering modules 200 is one.

Alternatively, as shown in fig. 6, the first receiving circuit 230 includes:

a first low noise amplifier 231, wherein the output end of the first low noise amplifier 231 is connected to the output port LNAOUT of the rf transceiver module 20; a second switching unit 232, a first end of the second switching unit 232 is connected to the input end of the first low noise amplifier 231, a partial second end of the second switching unit 232 is connected to the second end of the first filtering module 200, and is connected to the first antenna port LB ANT1 through the first filtering module 200 to receive the low frequency signal input by the first antenna port LB ANT1; a partial second terminal of the second switching unit 232 is connected to the second antenna port LB ANT2 to receive a low frequency signal input from the second antenna port LB ANT2.

The first low noise amplifier 231 and the second switch unit 232 are integrated in the rf transceiver module 20, and the second switch unit 232 selectively connects the rf path between the first low noise amplifier 231 and the first antenna port LB ANT1, and also selectively connects the rf path between the first low noise amplifier 231 and the second antenna port LB ANT2, so as to selectively perform low noise amplification on 5G rf signals of different frequency bands, thereby saving the number of the first low noise amplifiers 231 and reducing the area of the main board occupied by devices. It should be noted that, when low-noise amplification processing needs to be performed on low-frequency signals in multiple frequency bands, multiple first low-noise amplifiers 231 (for example, two first low-noise amplifiers 231) may be provided.

Alternatively, as shown in fig. 6, the number of the output ports LNAOUT of the radio frequency transceiver module 20 is multiple, and the number of the first low noise amplifiers 231 is multiple; the first receiving circuit 230 further includes:

and a third switching unit 233, wherein a plurality of first ends of the third switching unit 233 are respectively connected to the plurality of output ports in a one-to-one correspondence, and each second end of the third switching unit 233 is respectively connected to an output end of each first low noise amplifier 231 in a one-to-one correspondence. The third switching unit 233 serves to selectively turn on paths between the plurality of output ports and the plurality of first low noise amplifiers 231 to realize output paths of low frequency signals of different frequency bands. Further alternatively, the third switch unit 233 may be a double-pole double-throw switch, two first ends of which are connected to two output ports (output port LNA OUT1, output port LNA OUT 2) in a one-to-one correspondence, and two second ends of which are connected to output ends of the two first low noise amplifiers 231 in a one-to-one correspondence.

Optionally, as shown in fig. 6, the 2G low frequency transmitting circuit 250 includes a second power amplifier 251 and a first filtering unit 252; the 2G high frequency transmission circuit 260 includes a third power amplifier 261 and a second filtering unit 262. The input end of the second power amplifier 251 is connected to the input port GSM LB IN, the output end of the second power amplifier 251 is connected to the first end of the switch circuit 220 through the first filter unit 252, the input end of the third power amplifier 261 is connected to the input port GSM HB IN, and the output end of the third power amplifier 261 is connected to the high-frequency output port GSM HB OUT through the second filter unit 262. The second power amplifier 251 and the third power amplifier 261 are respectively configured to amplify the 2G low-frequency signal and the 2G high-frequency signal, and the first filtering unit 252 and the second filtering unit 262 are respectively configured to filter the 2G low-frequency signal and the 2G high-frequency signal.

In one embodiment, as shown in fig. 7, the first filtering module 200 is a duplexer Du1; the first power amplifier 211 is a power amplifier LB PA, and the first switching unit 212 is a multi-channel selection switch SP8T1; the switching circuit 220 is a multi-channel selection switch SP8T2. The number of the first low noise amplifiers 231 is two, and the first low noise amplifiers are low noise amplifiers LNA1 and LNA2; the number of the second switch units 232 is two, and the second switch units are respectively a multi-channel selection switch SP4T1 and a multi-channel selection switch SP4T1; the third switching unit 233 is a double pole double throw switch DPDT1. Coupling circuit 240 is coupler Do; the second power amplifier 251 and the first filtering unit 252 are respectively a power amplifier 2G LB PA and a filter F1; the third power amplifier 261 and the second filtering unit 262 are a power amplifier 2G HB PA and a filter F2, respectively.

The input end of the power amplifier LB PA is connected to the input port PA IN, the first end of the multi-channel selection switch SP8T1 is connected to the output end of the power amplifier LB PA1, and the plurality of second ends of the multi-channel selection switch SP8T1 are respectively connected to the first ends of the plurality of duplexers Du1 IN a one-to-one correspondence manner (for example, the two second ends of the multi-channel selection switch SP8T1 are respectively connected to the first ends of the two duplexers Du1 IN a one-to-one correspondence manner).

A plurality of first ends of the multichannel selection switch SP8T2 are respectively correspondingly connected with second ends of the plurality of duplexers Du1 one by one; a second terminal of the multichannel selection switch SP8T2 is connected to the first antenna port LB ANT1.

The first ends of the double-pole double-throw switch DPDT1 are respectively connected with the output port LNA OUT1 and the output port LNA OUT2 in a one-to-one correspondence manner, the second ends of the double-pole double-throw switch DPDT1 are respectively connected with the output ends of the low noise amplifier LNA1 and the low noise amplifier LNA2 in a one-to-one correspondence manner, the first end of the multichannel selector switch SP4T1 is connected with the input end of the low noise amplifier LNA1, and part of the second ends of the multichannel selector switch SP4T1 is connected with the second end of the duplexer Du.

The input end of the power amplifier 2G LB PA is connected to the input port GSM LB IN, the output end of the power amplifier 2G LB PA is connected to the first end of the second gating unit 230 through the filter F1, the input end of the power amplifier 2G HB PA is connected to the input port GSM HB IN, and the output end of the power amplifier 2G HB PA is connected to the high-frequency output port GSM HB OUT through the filter F2.

For convenience of description, the signal transceiving process of the rf transceiver module 20 in this embodiment is described by taking the low frequency signal as an N28 frequency band signal as an example:

the transmission process of the N28 low-frequency signal: the rf transceiver 10 outputs an N28 transmit signal through the input port PA IN to enter the rf transceiver module 20, performs signal amplification through the first power amplifier 211 of the transmitting circuit 210, performs filtering processing through the first switch unit 212 and the first filter module 200, outputs the filtered signal to the first antenna port LB ANT1 through the switch circuit 220 and the coupling circuit 240, and finally reaches the first antenna ANT1.

Main set receiving process of N28 low-frequency signals: the first antenna ANT1 receives N28 low-frequency signals from the space, the N28 low-frequency signals enter the radio frequency transceiver module 20 through the first antenna port LB ANT1, enter the first filter module 200 through the coupling circuit 240 and the switch circuit 220 for filtering, enter the first low noise amplifier 231 through the second switch unit 232 for amplification, and then reach the output port through the third switch to be output to the radio frequency transceiver 10.

MIMO reception process of N28 low frequency signal: the third antenna ANT3 receives the N28 low frequency signal from the space, the N28 low frequency signal enters the radio frequency transceiver module 20 through the second antenna port LB ANT2, is filtered by the second filter module 40, enters the first low noise amplifier 231 through the second switch unit 232 for amplification, and then reaches the output port through the third switch 233 to be output to the radio frequency transceiver 10.

As shown in fig. 8, in one embodiment, the rf transceiver module 20 is further configured with an auxiliary input port LB TXOU, an auxiliary output port LNA _ AUX, and an auxiliary transceiver port LB _ TRX; wherein: two first ends of the first filtering module 80 are respectively connected to the auxiliary input port LB TXOU and the auxiliary output port LNA _ AUX in a one-to-one correspondence manner, and a second end of the first filtering module 80 is connected to the auxiliary transceiving port LB _ TRX. The externally-hung first filtering module 80 can filter the low-frequency signals received and transmitted by the radio frequency transceiver module 20, and meanwhile, the number of duplexers inside the radio frequency transceiver module 20 can be reduced, and the size of the radio frequency transceiver module 20 is reduced.

Optionally, as shown in fig. 8, the radio frequency transceiver module 20 includes: a transmitting circuit 210, a switching circuit 220, a first receiving circuit 230.

The transmitting circuit 210 is connected to the input port PA IN and the auxiliary input port LB TXOU, respectively, and configured to amplify the low-frequency signal received by the input port PA IN.

The first receiving circuit 230 is connected to output ports (for example, two output ports, i.e., an output port LNA OUT1 and an output port LNA OUT 2), an auxiliary output port LNA _ AUX, and a second antenna port LB ANT2, respectively, and is configured to amplify a received low-frequency signal.

The switch circuit 220 is connected to the transmitting circuit 210, the first receiving circuit 230, the auxiliary transceiving port LB _ TRX, and the first antenna port LB ANT1, respectively, and is configured to selectively turn on radio frequency paths between the transmitting circuit 210, the first receiving circuit 230, and the first antenna port LB ANT1, respectively.

Optionally, as shown in fig. 8, the radio frequency transceiver module 20 further includes: the coupling circuit 240 is connected to the switching circuit 220 and the first antenna port LB ANT1, respectively, and is configured to couple low-frequency signals in a radio frequency path between the switching circuit 220 and the first antenna port LB ANT1.

The transmitting circuit 210, the first receiving circuit 230, the switching circuit 220, and the coupling circuit 240 are described in the above embodiments, and are not described herein again.

Alternatively, as shown in fig. 9, the low frequency signal includes radio frequency signals of a plurality of low frequency bands; the rf transceiver module 20 further includes:

two first ends of the filter circuit 270 are respectively connected to the transmitting circuit 210 and the first receiving circuit 230 in a one-to-one correspondence manner, and a second end of the filter circuit 270 is connected to the switch circuit 220 for filtering stray waves except for low-frequency signals.

The frequency band of the low frequency signal filtered by the filter circuit 270 is different from the frequency band of the low frequency signal filtered by the first filter module 80. Specifically, a first filtering module 80 and one or more filtering circuits 270 may be provided, where the first filtering module 80 is configured to filter out low-frequency signals of a main frequency band, and the filtering circuits 270 are configured to filter out low-frequency signals of other secondary frequency bands. Taking the low-frequency signals that can be received and transmitted by the rf transceiver module 20 as signals of three different frequency bands as an example, as shown in fig. 10, a first filtering module 80 and two filtering circuits 270 may be provided to implement filtering processing of the low-frequency signals of the three frequency bands by the first filtering module 80.

Optionally, the rf transceiver module 20 may also be configured with an input port GSM LB IN, an input port GSM HB IN and a high frequency output port GSM HB OUT. The radio frequency transceiver module 20 further includes a 2G low frequency transmitting circuit and a 2G high frequency transmitting circuit. Reference is made to the above embodiments through the related description of the 2G low frequency transmitting circuit and the 2G high frequency transmitting circuit, which is not described herein again.

Optionally, as shown in fig. 10, the specific circuit structure diagram of an embodiment is shown, and for related description of the circuit structure diagram, reference is made to the above-mentioned embodiment, and details are not repeated here. For convenience of description, the signal transceiving process of the rf transceiver module 20 in this embodiment is described by taking the low frequency signal as an N28 frequency band signal as an example:

the transmission process of the N28 low-frequency signal: the rf transceiver 10 outputs an N28 transmission signal through the input port pair to enter the rf transceiver module 20, performs signal amplification through the first power amplifier 211 of the transmission circuit 210, outputs the signal to the auxiliary input port LB TXOU through the first switch unit 212 to reach the first filter module 80, and outputs the signal to the first antenna port LB ANT1 through the auxiliary transmit-receive port LB _ TRX and the switch circuit 220 after filtering processing of the first filter module 80, and finally reaches the first antenna ANT1.

Main set receiving process of N28 low-frequency signals: the first antenna ANT1 receives N28 low-frequency signals from the space, the N28 low-frequency signals enter the rf transceiver module 20 through the first antenna port LB ANT1, enter the first filter module 80 through the coupling circuit 240, the switch circuit 220 and the auxiliary transceiver port LB _ TRX for filtering, enter the first low noise amplifier 231 through the auxiliary output port LNA _ AUX and the second switch unit 232 for amplification, and then reach the output port through the third switch to be output to the rf transceiver 10.

MIMO reception process of N28 low frequency signal: the third antenna ANT3 receives the N28 low frequency signal from the space, the N28 low frequency signal is filtered by the second filtering module 40, enters the rf transceiver module 20 through the second antenna port LB ANT2, enters the first low noise amplifier 231 through the second switch unit 232 for amplification, and then reaches the output port through the third switch to be output to the rf transceiver 10.

As shown in fig. 11, in one embodiment, the rf receiving module 30 includes a second receiving circuit 310 and a third receiving circuit 320, wherein the second receiving circuit 310 is connected to the output port of the rf receiving module 30 and the third antenna port LB ANT3, respectively, for supporting diversity reception of low-frequency signals; the third receiving circuit 320 is respectively connected to the output end of the rf receiving module 30 and the fourth antenna port LB ANT4, and is configured to support diversity MIMO reception of low-frequency signals.

Optionally, the rf receiving module 30 further includes a first gating circuit 330, where the first gating circuit 330 is respectively connected to the second receiving circuit 310, the third receiving circuit 320 and the third antenna port LB ANT3, and is configured to selectively turn on rf paths between the second receiving circuit 310, the third receiving circuit 320 and the third antenna port LB ANT 3. The second receiving circuit 310 may also be connected to a fourth antenna port LB ANT5 to connect a fourth antenna ANT4. Further alternatively, the first gating circuit 330 may be a multi-channel selection switch SP8T3.

Optionally, the rf receiving module 30 further includes a second gating circuit 340, where the second gating circuit 340 is respectively connected to the two output ports of the rf receiving module 30, the second receiving circuit 310, and the third receiving circuit 320, and is configured to selectively turn on the rf paths between the two output ports of the rf receiving module 30 and the second receiving circuit 310 and the third receiving circuit 320, respectively. Further alternatively, the second gating circuit 340 may be a double pole double throw switch DPDT2.

Alternatively, as shown in fig. 12, the second receiving circuit 310 includes a low noise amplifier LAN3, a multi-channel selection switch SP4T3, a filter F3, and a filter F4, an input terminal of the low noise amplifier LAN3 is connected to a first terminal of the multi-channel selection switch SP4T1, an output terminal of the low noise amplifier LAN3 is connected to the second gating circuit 340, a first terminal of the multi-channel selection switch SP4T1 is connected to first terminals of the filter F3 and the filter F4, and second terminals of the filter F3 and the filter F4 are connected to the first gating circuit 330. The third receiving circuit 320 includes a low noise amplifier LAN4, a multi-channel selection switch SP4T4, and a filter F6, wherein an input terminal of the low noise amplifier LAN4 is connected to a first terminal of the multi-channel selection switch SP4T4, an output terminal of the low noise amplifier LAN4 is connected to the second gating circuit 340, the first terminal of the multi-channel selection switch SP4T4 is connected to a first terminal of the filter F6, and a second terminal of the filter F6 is connected to the first gating circuit 330. The number of the filters F in the second receiving circuit 310 and the number of the filters F in the third receiving circuit 320 may be one or more. In other embodiments, the filter in the second receiving circuit 310 and the filter in the third receiving circuit 320 may also be disposed in a side near the antenna outside the radio frequency receiving module 30.

Optionally, as shown in fig. 13, the radio frequency receiving module 30 is further configured with a medium-high frequency antenna port MHB ANT, where the high-frequency antenna port MHB ANT is used to connect to a fifth antenna to support receiving of medium-frequency signals and high-frequency signals, so as to extend the frequency range of the radio frequency receiving module 30 for receiving radio frequency signals, so as to improve the receiving frequency range of the radio frequency system. Specifically, the rf receiving module 30 further includes a third receiving circuit 350, the third receiving circuit 350 is configured to be connected to the middle-high frequency antenna port MHB ANT, and the third receiving circuit 350 may include a multi-pole multi-throw switch nPnT, a low noise amplifier, a multi-channel selection switch, a filter F, and a multi-channel selection switch.

For convenience of description, the signal receiving process of the rf receiving module 30 in this embodiment is described by taking the low frequency signal as an N28 frequency band signal as an example:

diversity reception process of N28 low frequency signal: the second antenna ANT2 receives the N28 low frequency signal from the space, the N28 low frequency signal enters the rf receiving module 30 through the third antenna port LB ANT3, enters the filter of the second receiving circuit 310 through the first gating circuit 330 for filtering, enters the low noise amplifier LAN through the multi-channel selection switch SP4T3 for amplification, and then reaches the output port LNAOUT through the second gating circuit 340 to be output to the rf transceiver 10.

MIMO reception process of N28 low frequency signals: the fourth antenna ANT4 receives the N28 low frequency signal from the space, the N28 low frequency signal enters the rf receiving module 30 through the fourth antenna port LB ANT4, then enters the low noise amplifier LAN4 through the multi-channel selection switch SP4T1 of the third receiving circuit 320 for amplification, and then reaches the output port LNAOUT through the second gating circuit 340 to be output to the rf transceiver 10.

The embodiment of the application further provides a communication device, and the communication device is provided with the radio frequency system in any embodiment.

By arranging the radio frequency system on the communication equipment, 4 x 4MIMO (multiple input multiple output) receiving can be realized, and the throughput of low-frequency signals can be improved by times under the condition of not increasing frequency spectrum resources and antenna transmitting power; the downloading rate can be improved to improve the experience of users, and meanwhile, when the communication equipment is positioned at the edge of a cell, deep in a building, in an elevator and other weak signal environments, the 4 x 4MIMO receiving mode is adopted, so that higher diversity gain and larger coverage distance are achieved; the device has high integration level, the area of the substrate occupied by each device in the radio frequency system is reduced, meanwhile, the layout and wiring can be simplified, and the cost is saved.

As shown in fig. 14, further taking the communication device as a mobile phone 11 as an example for illustration, specifically, as shown in fig. 14, the mobile phone 11 may include a memory 21 (which optionally includes one or more computer-readable storage media), a processor 22, a peripheral device interface 23, a radio frequency system 24, and an input/output (I/O) subsystem 26. These components optionally communicate over one or more communication buses or signal lines 29. It will be appreciated by those skilled in the art that the handset 11 shown in figure 14 is not intended to be limiting and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components. The various components shown in fig. 14 are implemented in hardware, software, or a combination of both hardware and software, including one or more signal processing and/or application specific integrated circuits.

The memory 21 optionally includes high-speed random access memory, and also optionally includes non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid-state memory devices. Illustratively, the software components stored in memory 21 include an operating system 211, a communications module (or set of instructions) 212, a Global Positioning System (GPS) module (or set of instructions) 213, and the like.

The processor 22 and other control circuitry, such as control circuitry in the radio frequency system 24, may be used to control the operation of the handset 11. The processor 22 may be based on one or more microprocessors, microcontrollers, digital signal processors, baseband processors, power management units, audio codec chips, application specific integrated circuits, and the like.

The processor 22 may be configured to implement a control algorithm that controls the use of the antenna in the handset 11. The processor 22 may also issue control commands for controlling various switches in the radio frequency system 24, and the like.

The I/O subsystem 26 couples input/output peripheral devices on the cell phone 11, such as a keypad and other input control devices, to the peripheral device interface 23. The I/O subsystem 26 optionally includes a touch screen, keys, tone generators, accelerometers (motion sensors), ambient and other sensors, light emitting diodes and other status indicators, data ports, and the like. Illustratively, a user may control the operation of the handset 11 by supplying commands through the I/O subsystem 26, and may receive status information and other outputs from the handset 11 using the output resources of the I/O subsystem 26. For example, a user pressing button 261 may turn the phone on or off.

The rf system 24 may be the rf system of any of the previous embodiments.

In the description herein, reference to the description of "one of the embodiments," "optionally," or the like means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A radio frequency system, comprising:

a radio frequency transceiver;

a radio frequency receiving module connected with the radio frequency transceiver and configured with a third antenna port configured to connect with a second antenna and a fourth antenna port configured to connect with a fourth antenna, the radio frequency receiving module being configured to support diversity reception of the low frequency signals through the third antenna port and support MIMO reception of the low frequency signals through the fourth antenna port;

the two first ends of the first filtering module are respectively connected with the input port and the output port in a one-to-one correspondence manner, and the second end of the first filtering module is connected with the first antenna port and used for filtering stray waves except the low-frequency signals;

the first filtering module is arranged outside the radio frequency transceiving module or integrated inside the radio frequency transceiving module; the first filtering module is used for filtering the low-frequency signal which is received by the input port and amplified by the radio frequency transceiving module so as to output the low-frequency signal which is amplified and filtered to the first antenna port and output the low-frequency signal to the first antenna through the first antenna port; the first filtering module carries out filtering processing on the low-frequency signal received by the first antenna port, and the low-frequency signal after filtering processing is amplified by the radio frequency transceiving module and then output to the output port so as to be output to the radio frequency transceiver through the output port.

2. The radio frequency system according to claim 1, wherein the radio frequency transceiver module is further configured with an auxiliary input port, an auxiliary output port, an auxiliary transceiver port; the radio frequency transceiver module includes:

the transmitting circuit is respectively connected with the input port and the auxiliary input port and is used for amplifying the low-frequency signal received by the input port;

the first receiving circuit is respectively connected with the output port, the auxiliary output port and the second antenna port and is used for amplifying the received low-frequency signal;

a switch circuit, connected to the transmitting circuit, the first receiving circuit, the auxiliary transceiving port, and the first antenna port, respectively, for selectively turning on radio frequency paths between the transmitting circuit and the first receiving circuit, and the first antenna port, respectively;

the two first ends of the first filtering module are respectively connected with the auxiliary input port and the auxiliary output port in a one-to-one correspondence manner, and the second end of the first filtering module is connected with the auxiliary transceiving port.

3. The radio frequency system according to claim 2, wherein the low frequency signal comprises a plurality of low frequency band radio frequency signals; the radio frequency transceiver module further comprises:

two first ends of the filter circuit are respectively connected with the transmitting circuit and the first receiving circuit in a one-to-one correspondence manner, and a second end of the filter circuit is connected with the switch circuit and is used for filtering stray waves except the low-frequency signals;

the frequency band of the low-frequency signal filtered by the filter circuit is different from the frequency band of the low-frequency signal filtered by the first filter module.

4. The rf system of claim 1, wherein the first filtering module is integrated within the rf transceiver module, the rf transceiver module comprising:

the transmitting circuit is connected with the input port and is used for amplifying the low-frequency signal received by the input port;

the first receiving circuit is respectively connected with the output port and the second antenna port and is used for amplifying the received low-frequency signal;

the switch circuit is respectively connected with the transmitting circuit, the first receiving circuit and the first antenna port and is used for selectively conducting radio frequency paths between the transmitting circuit and the first receiving circuit and between the first antenna port and the first receiving circuit;

the two first ends of the first filtering module are respectively connected with the transmitting circuit and the first receiving circuit in a one-to-one correspondence manner, and the second end of the first filtering module is connected with the switch circuit.

5. The radio frequency system according to claim 4, wherein the low frequency signal comprises a plurality of low frequency band radio frequency signals; wherein:

the number of the first filtering modules is multiple, two first ends of each first filtering module are respectively connected with the transmitting circuit and the first receiving circuit in a one-to-one correspondence mode, a second end of each first filtering module is connected with the switch circuit, and the frequency bands of the low-frequency signals output by the first filtering modules are different.

6. The radio frequency system according to claim 5, wherein the switch circuit comprises a multi-channel selection switch, and a plurality of first ends of the multi-channel selection switch are respectively connected with the second ends of the plurality of first filtering modules in a one-to-one correspondence manner; and the second end of the multichannel selection switch is connected with the first antenna port.

7. The radio frequency system of claim 5, wherein the transmit circuit comprises:

the input end of the first power amplifier is connected with the input port;

and the first end of the first switch unit is connected with the output end of the first power amplifier, and a plurality of second ends of the first switch unit are respectively connected with the first ends of the first filtering modules in a one-to-one correspondence manner.

8. The radio frequency system according to claim 5, wherein the first receiving circuit comprises:

the output end of the first low noise amplifier is connected with the output port;

and a first end of the second switch unit is connected with the input end of the first low noise amplifier, a part of second ends of the second switch unit are connected with the second end of the first filtering module, and a part of second ends of the second switch unit are connected with the second antenna port.

9. The radio frequency system according to claim 8, wherein the number of the output ports is plural, and the number of the first low noise amplifiers is plural; the first receiving circuit further comprises:

and a plurality of first ends of the third switching unit are respectively connected with the plurality of output ports in a one-to-one correspondence manner, and each second end of the third switching unit is respectively connected with the output end of each first low noise amplifier in a one-to-one correspondence manner.

10. The radio frequency system according to any of claims 2-9, wherein the radio frequency transceiver module further comprises:

and the coupling circuit is respectively connected with the switch circuit and the first antenna port and is used for coupling the low-frequency signal in a radio frequency path between the switch circuit and the first antenna port.

11. The radio frequency system of claim 1, further comprising:

and the second filtering module is respectively connected with the second antenna port and the third antenna and is used for filtering the low-frequency signal received by the third antenna.

12. The radio frequency system of claim 11, further comprising:

and the output end of the first amplification module is connected with the second antenna port, and the input end of the first amplification module is connected with the second filtering module and used for amplifying the low-frequency signals after filtering.

13. The radio frequency system of claim 1, further comprising:

and the third filtering module is respectively connected with the fourth antenna port and the fourth antenna and is used for filtering the low-frequency signal received by the fourth antenna.

14. The radio frequency system of claim 13, further comprising:

and the output end of the second amplification module is connected with the fourth antenna port, and the input end of the second amplification module is connected with the third filtering module and used for amplifying the low-frequency signal after filtering.

15. The radio frequency system of claim 1, wherein the low frequency signal comprises at least one of N5, N8, N20, N28, N71 frequency bands.

16. A communication device comprising a radio frequency system according to any of claims 1-15.