CN111082833A - Radio frequency front-end circuit and terminal - Google Patents
Radio frequency front-end circuit and terminal Download PDFInfo
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- CN111082833A CN111082833A CN201911375432.XA CN201911375432A CN111082833A CN 111082833 A CN111082833 A CN 111082833A CN 201911375432 A CN201911375432 A CN 201911375432A CN 111082833 A CN111082833 A CN 111082833A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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Abstract
The embodiment of the application discloses a radio frequency front-end circuit and a terminal, and relates to the field of communication. The main antenna and one of the plurality of antenna wires are controlled to be connected through the single-pole multi-throw switch so as to adjust and change antenna parameters of the main antenna, so that the main antenna can be suitable for different application scenes, multiplexing of antennas of different types is realized, and the problem that a clearance area inside a terminal is small due to the fact that the plurality of antennas need to be arranged in the related technology is solved.
Description
Technical Field
The present invention relates to the field of antennas, and in particular, to a radio frequency front end circuit and a terminal.
Background
With the increase of the functions of the mobile phone, the number of antennas arranged in the mobile phone is more and more, for example: the mobile phone sets different radio frequency antennas according to different application scenarios, for example: the mobile phone comprises a bluetooth antenna, an NFC (near field Communication) antenna, a GPS (Global Positioning System) antenna, a WLAN (wireless local area network) antenna, a voice/data Communication antenna, and the like, wherein the current mobile phone is increasingly pursuing lightness and thinness, the numerous antennas increase to cause a clearance area of each antenna in the terminal to be smaller and smaller, and meanwhile, the sizes and positions of the antennas are different, so how to ensure that the interference degree between the antennas is smaller in a limited space is a problem to be solved urgently at present.
Disclosure of Invention
The radio frequency front-end circuit and the terminal provided by the embodiment of the application can solve the problem that a plurality of antennas arranged in the terminal in the related art have large interference. The technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a radio frequency front-end circuit, including:
the antenna comprises a main antenna, M antenna wires, N antenna matching networks, a single-pole multi-throw switch and a radio frequency circuit; the main antenna is provided with a feed point, the single-pole multi-throw switch is provided with a movable end, P immobile ends and a control end, P is greater than or equal to M + N, the M antenna wires are respectively connected with one immobile end of the P immobile ends, and the N antenna matching networks are respectively connected with one immobile end of the P immobile ends; the N antenna matching networks are respectively grounded;
the single-pole multi-throw switch is used for receiving a control signal through the control end and controlling the movable end to be connected with one of the P immovable ends according to the control signal;
the radio frequency circuit is used for feeding the main antenna through a feeding point.
In one possible design, the main antenna is a bottom frame of the terminal, and a gap is provided between the bottom frame and two side frames of the terminal.
In one possible design, the distance from the feeding point on the bottom frame to any one end of the bottom frame is greater than the distance of the gap.
In one possible design, M is 2 and N is 2, the polarization directions of the two antenna traces are perpendicular to each other and different from the polarization direction of the main antenna.
In a second aspect, an embodiment of the present application provides a terminal, including:
the antenna comprises a main antenna, M antenna wires, N antenna matching networks, a single-pole multi-throw switch, a radio frequency circuit and a controller; the single-pole multi-throw switch is provided with 1 movable end.
The beneficial effects brought by the technical scheme provided by some embodiments of the application at least comprise:
the main antenna and one of the plurality of antenna wires are controlled to be connected through the single-pole multi-throw switch so as to adjust and change antenna parameters of the main antenna, so that the main antenna can be suitable for different application scenes, multiplexing of antennas of different types is realized, and the problem that a clearance area inside a terminal is small due to the fact that the plurality of antennas need to be arranged in the related technology is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an rf front-end circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an rf front-end circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of an antenna matching network provided by an embodiment of the present invention;
fig. 4 is a circuit diagram of an antenna matching network provided by an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and fig. 2, a schematic diagram of an rf front-end circuit according to an embodiment of the present invention includes: the antenna comprises a main antenna 1, a radio frequency circuit 2, antenna wires 31-3M, an antenna matching network 41-4N, a single-pole multi-throw switch 5 and a controller 6. The number of the antenna wires is M, and the number of the antenna matching networks is N; the shapes, impedances and polarization directions of the M antenna wires can be the same or different; the impedances of the N antenna matching networks are different. The single-pole multi-throw switch 5 is provided with 1 movable end, P immovable ends and 1 control end, P is larger than or equal to M + N, and the movable end can be switched to be connected with any immovable end in the P immovable ends so as to realize the selection of different paths; the control end is used for receiving the switch control signal and switching the movable end according to the indication of the switch control signal, and it can be understood that when P is greater than M + N, the stationary end of the single-pole multi-throw switch may not have a connection path, and if the movable end is connected with the stationary end, the movable end is equivalent to being suspended. The antenna wires 31-3M are respectively connected with one immovable end, and different antenna wires are connected with different immovable ends; the antenna matching network 41-4N are respectively connected with one immobile end, and different antenna matching networks are connected with different immobile ends; in addition, M antenna wires and N antenna matching networks form M + N paths, and the M + N channels are respectively connected with different fixed ends of the single-pole multi-throw switch. The main antenna is provided with a feed point, and the feed point is provided with a port for transmitting radio frequency signals.
The controller 6 is used for generating a switch control signal and sending the switch control signal to the single-pole multi-throw switch 5; the controller 6 may be implemented in at least one hardware form of a Digital Signal Processing (DSP), a field-programmable gate array (FPGA), and a Programmable Logic Array (PLA). The switch control signal may be a digital pulse signal, and the controller 6 uses the encoding of the digital pulse signal to control the connection of the moving terminal and the different stationary terminal in the single-pole multi-throw switch. For example: the code of the digital pulse signal is 1000, and the movable end is controlled to be connected with the fixed end 1; the code of the digital pulse signal is 0100, and the movable end is controlled to be connected with the immovable end 2; the code of the digital pulse signal is 0010, and the movable end is controlled to be connected with the fixed end 3; the code of the digital pulse signal is 0001, and the control movable end is connected with the fixed end 4.
The single-pole multi-throw switch 5 is used for receiving a switch control signal from the controller through a control end and controlling the movable end to be connected with any one of the P immovable ends according to the switch control signal; the main antenna 1 may be connected to one of the M antenna traces, the main antenna 1 may be connected to one of the N antenna matching networks, and the main antenna may be suspended by the single-pole multi-throw switch 5. When the main body antenna 1 is connected with a certain antenna wire, the antenna parameters of the antenna wire are different from those of the main body antenna, the antenna formed by the main body antenna and the antenna wire, and the antenna parameters of the formed antenna, such as impedance, polarization direction and the like, change relative to the main body antenna, so that different antenna wires can be selected to be combined with the main body antenna according to different application scenes, and the effect of adaptively adjusting the antenna parameters of the antenna is realized. When the antenna parameters of the main antenna 1 are changed, different antenna matching networks can be selected for impedance matching according to the main antenna 1 with different antenna parameters, so that the main antenna can achieve the maximum transmitting power under any working frequency.
And the radio frequency circuit is used for generating a radio frequency signal and transmitting the radio frequency signal to the main body antenna 1 through the feeding point. The radio frequency circuit can transmit radio frequency signals through the main antenna 1, and can also receive radio frequency signals sent by other equipment through the main antenna 1.
The radio frequency front-end circuit provided by the invention controls the connection of the main antenna and one of the plurality of antenna wires through the single-pole multi-throw switch so as to adjust and change the antenna parameters of the main antenna, so that the main antenna can be suitable for different application scenes, the multiplexing of different types of antennas is realized, the problem that the clearance area inside a terminal is smaller due to the need of setting the plurality of antennas in the related art is solved, in addition, the single-pole multi-throw switch controls the connection of the main antenna and one of the plurality of antenna matching networks so as to realize impedance matching when the antenna parameters of the main antenna change, and the radiation efficiency of the main antenna is improved.
In a possible embodiment, the main antenna is a bottom frame of the terminal, the middle frame of the terminal includes a top frame, a bottom frame and two side frames, the middle frame is made of metal, and a gap with a preset size is arranged between the two side frames and the bottom frame.
Further, a feeding point is arranged on the bottom frame, and the bottom frame and the two measurements are provided with a gap therebetween, so that the bottom frame comprises a main body and two tail ends, and the distance from the feeding point to any one tail end is greater than that of the gap. For example: the length of the bottom frame is 5cm, and the length of the gap is 5mm, then the distance between the feeding point and the two ends of the bottom frame needs to be more than 5 mm.
In one possible embodiment, M is 2, N is 2, and the polarization directions of the two antenna traces are perpendicular to each other; the impedances of the two antenna matching networks are not the same.
For example, referring to the rf front-end circuit shown in fig. 2, the rf front-end circuit includes: the antenna comprises a controller 20, an antenna matching network 21, a single-pole multi-throw switch 22, an antenna matching network 23, an antenna trace 24, an antenna trace 25, a main antenna matching network 27 and a main antenna 28. The single-pole multi-throw switch 22 comprises 1 movable end, 4 immovable ends and 1 control end, a main antenna 28 is connected with the immovable end of the single-pole multi-throw switch 22 through a main antenna matching network 26, and a radio frequency circuit 27 is connected with the main antenna 28 through a feed point. The antenna wire 24 is connected with the immobile end 1 of the single-pole multi-throw switch 22, and the antenna wire 25 is connected with the immobile end 2 of the single-pole multi-throw switch 22; one end of the antenna matching network 21 is grounded, and the other end is connected with the stationary end 3 of the single-pole multi-throw switch 22; one end of the antenna matching network 23 is connected with the stationary end 4 of the single-pole multi-throw switch 22, and the other end is grounded.
Further, the circuit structure of the antenna matching network (or the main antenna matching network) can be shown with reference to fig. 3 and 4.
In fig. 3, the antenna matching network includes a first resistor R1, a second resistor R2, and a first capacitor C1, one end of the first resistor R1 is grounded, the other end of the first resistor R1 is connected to one end of a first capacitor C1 and one end of a second resistor R2, the other end of the first capacitor C1 is grounded, and the other end of the first capacitor C1 is connected to the stationary end of the single-pole multi-throw switch. The other end of the second resistor R2 is connected to the stationary end of the single pole, multiple throw switch.
In fig. 4, the antenna matching network includes a third resistor R3, a second capacitor C2, and a third capacitor C3. One end of the second capacitor C2 is grounded and connected with one end of the third resistor R3, and the other end of the second capacitor C2 is grounded and connected with the other end of the third capacitor C3; the other end of the third resistor R3 is connected to one end of a third capacitor C3 and to the stationary end of the single-pole-multiple-throw switch, and the other end of the third capacitor C3 is also connected to the stationary end of the single-pole-multiple-throw switch.
An embodiment of the present application further provides a terminal, where the terminal includes: the antenna comprises a main antenna, M antenna wires, N antenna matching networks, a single-pole multi-throw switch, a radio frequency circuit and a controller; the single-pole multi-throw switch is provided with 1 movable end, P immovable ends and 1 control end, wherein P is M + N; the M antenna wires and the N antenna matching networks are connected with the P immobile ends in a one-to-one mode, and each immobile end is connected with one antenna wire or one antenna matching network; the controller is connected with the control end of the single-pole multi-throw switch,
the radio frequency circuit is used for feeding power to the main body antenna through a feeding point;
the controller is used for generating a switch control signal and sending the switch control signal to a control end of the single-pole multi-throw switch;
the single-pole multi-throw switch is used for receiving a switch control signal from the controller through the control end and controlling the movable end to be connected with any one of the P immovable ends according to the switch control signal.
For example, referring to the schematic structural diagram of the terminal shown in fig. 5, where M is 2 and N is 2, the terminal includes: the antenna comprises a main body antenna 21, an antenna trace 22, an antenna trace 28, an antenna matching network 23, an antenna matching network 25, a single-pole multi-throw switch 26, a controller 24 and a radio frequency circuit 29. The main body antenna 21 is provided with a feeding point (not shown in fig. 5) through which the radio frequency circuit 29 feeds the main body antenna 21. The antenna trace 22 is connected to a stationary terminal of the single-pole multi-throw switch 26, the antenna trace 28 is connected to a stationary terminal of the single-pole multi-throw switch 26, the antenna matching network 23 is connected to a stationary terminal of the single-pole multi-throw switch 26, and the antenna matching network 25 is connected to a stationary terminal of the single-pole multi-throw switch 26.
In a possible implementation manner, the main body antenna is a bottom frame of the terminal, the terminal further includes two side frames, the two side frames are respectively disposed on two sides of the bottom frame, a gap is disposed between the two side frames and the bottom frame, the two side frames are provided with grounding points, and a distance between a position of the grounding point and the bottom frame is greater than a distance of the gap. For example: referring to fig. 5, the bottom frame 21 of the terminal is a theme antenna, a gap is provided between the bottom frame 21 and the side frames 20 and 30, and both the side frames 20 and 30 are grounded.
In one possible embodiment, a ground plate is arranged between the two side frames, and the two side frames and the antenna matching network are grounded through the ground plate. For example: a grounding plate made of metal materials is arranged between the two side edges, and the two side frames and the antenna matching network are grounded through the grounding plate. The grounding plate can be provided with a plurality of openings, and the shape of the plurality of openings can be circular or rectangular.
The working principle and the connection relationship of each component in the terminal can refer to the description of the antenna structure in fig. 1 and fig. 2, and are not described herein again.
The terminal of the embodiment of the application can be a mobile phone, a tablet computer, a wearable device and the like.
The terminal provided by the invention controls the connection of the main antenna and one of the plurality of antenna wires through the single-pole multi-throw switch to adjust and change the antenna parameters of the main antenna, so that the main antenna can be suitable for different application scenes, the multiplexing of different types of antennas is realized, and the problem that the clearance area inside the terminal is smaller due to the need of setting a plurality of antennas in the related art is solved.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (10)
1. A radio frequency front end circuit, comprising: the method comprises the following steps:
the antenna comprises a main antenna, M antenna wires, N antenna matching networks, a single-pole multi-throw switch and a radio frequency circuit; the main antenna is provided with a feed point, the single-pole multi-throw switch is provided with 1 movable end, P fixed ends and 1 control end, P is not less than M + N, M is an integer greater than 1, and N is an integer greater than 1; the M antenna wires are respectively connected with one of the P immobile ends, and the N antenna matching networks are respectively connected with one of the P immobile ends; the N antenna matching networks are respectively grounded;
the single-pole multi-throw switch is used for receiving a control signal through the control end and controlling the movable end to be connected with one of the P immovable ends according to the control signal;
the radio frequency circuit is used for generating a radio frequency signal and transmitting the radio frequency signal to the main antenna through the feed point.
2. The rf front-end circuit of claim 1, wherein the body antenna is a bottom frame of a terminal, and a gap exists between the bottom frame and two side frames.
3. The rf front-end circuit of claim 2, wherein a distance from a feed point on the bottom frame to any one end of the bottom frame is greater than a distance of the gap.
4. The rf front-end circuit of claim 1, wherein M is 2 and N is 2, polarization directions of the two antenna traces are perpendicular to each other, and impedances of the two antenna matching networks are different.
5. The radio frequency front-end circuit of claim 1, wherein the antenna matching network comprises a first resistor, a second resistor, and a first capacitor; one end of the first resistor is grounded, the other end of the first resistor is connected with one end of the first capacitor, and the other end of the first resistor is connected with one end of the second resistor; the other end of the first capacitor is grounded, and the other end of the first capacitor is connected with the fixed end of the single-pole multi-throw switch; the other end of the second resistor is connected with the fixed end of the single-pole multi-throw switch.
6. The radio frequency front-end circuit of claim 1, wherein the antenna matching network comprises a third resistor, a second capacitor, and a third capacitor; one end of the second capacitor is grounded, and one end of the second capacitor is connected with one end of the third resistor; the other end of the second capacitor is grounded, and the other end of the second capacitor is connected with the other end of the third capacitor; the other end of the third resistor is connected with one end of a third capacitor, and the other end of the third resistor is connected with the immobile end of the single-pole multi-throw switch; the other end of the third capacitor is connected with the fixed end of the single-pole multi-throw switch.
7. The rf front-end circuit of claim 1, further comprising:
and the main antenna is connected with the movable end of the single-pole multi-throw switch through the main antenna matching network.
8. A terminal, characterized in that it comprises a radio-frequency front-end circuit according to any one of claims 1 to 7.
9. The terminal of claim 8, further comprising two side frames; the main body antenna is a bottom frame of the terminal, the two side frames are respectively arranged on two sides of the bottom frame, a gap is formed between the two side frames and the bottom frame, grounding points are arranged on the two side frames, and the distance between the grounding points and the bottom frame is larger than the distance between the gaps.
10. The terminal of claim 8, wherein a ground plane is disposed between the two side frames, and the two side frames and the antenna matching network are grounded through the ground plane.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911375432.XA CN111082833B (en) | 2019-12-27 | 2019-12-27 | Radio frequency front-end circuit and terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911375432.XA CN111082833B (en) | 2019-12-27 | 2019-12-27 | Radio frequency front-end circuit and terminal |
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| Publication Number | Publication Date |
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| CN111082833A true CN111082833A (en) | 2020-04-28 |
| CN111082833B CN111082833B (en) | 2021-09-17 |
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| CN201911375432.XA Active CN111082833B (en) | 2019-12-27 | 2019-12-27 | Radio frequency front-end circuit and terminal |
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| CN113992225A (en) * | 2021-10-25 | 2022-01-28 | 深圳警翼智能科技股份有限公司 | 5G law enforcement instrument antenna system, antenna intelligent matching method and 5G law enforcement instrument |
| CN114221645A (en) * | 2021-12-20 | 2022-03-22 | 歌尔科技有限公司 | Device, method and medium for improving performance of terminal equipment |
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| CN111082833B (en) | 2021-09-17 |
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