CN107196041B

CN107196041B - Antenna device and three-section type mobile terminal

Info

Publication number: CN107196041B
Application number: CN201710379911.3A
Authority: CN
Inventors: 张昌顺
Original assignee: Nubia Technology Co Ltd
Current assignee: Nubia Technology Co Ltd
Priority date: 2017-05-25
Filing date: 2017-05-25
Publication date: 2021-03-26
Anticipated expiration: 2037-05-25
Also published as: CN107196041A

Abstract

The invention discloses an antenna device and a three-section type mobile terminal, wherein the antenna device is used for the mobile terminal with a three-section type metal shell and comprises an antenna body, a coupling gap, an excitation source and a frequency switching channel; the three-section metal shell comprises a metal middle frame and two metal side frames distributed on two sides of the metal middle frame; one of the metal frames forms the antenna body; the metal middle frame forms a grounding end of the antenna device; the coupling gap is arranged between the metal middle frame and the antenna body; the antenna body and the excitation source are communicated through a frequency switching channel. The antenna device belongs to a full-network antenna, is easy to debug, has good performance, and can effectively solve the problem that the medium-high frequency cannot be considered in the three-section metal shell mobile phone in the prior art.

Description

Antenna device and three-section type mobile terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to an antenna device and a three-section mobile terminal.

Background

With the development of science and technology, the mobile phone with three-section type all-metal appearance is accepted by more and more users by virtue of hand feeling and color value. However, in a three-section all-metal-appearance mobile phone, the problem that the antenna is not easy to debug generally exists, the performance of the antenna is poor, the full-network antenna is difficult to realize, and the problem that medium-high frequency cannot be considered at the same time exists.

Disclosure of Invention

The invention mainly aims to provide an antenna device and a three-section type mobile terminal, and aims to solve the problems that the existing three-section type all-metal appearance mobile phone antenna is difficult to debug and poor in performance.

In order to achieve the above object, the present invention provides an antenna device for a mobile terminal with a three-section metal housing, the antenna device including an antenna body, a coupling slot, an excitation source, and a frequency switching channel;

the three-section metal shell comprises a metal middle frame and two metal side frames distributed on two sides of the metal middle frame; one of the metal frames forms the antenna body; the metal middle frame forms a grounding end of the antenna device;

the coupling gap is arranged between the metal middle frame and the antenna body;

the antenna body and the excitation source are communicated through a frequency switching channel.

Optionally, the frequency switching channel is specifically a low-frequency channel and a medium-high frequency channel which are arranged in parallel; when the antenna body is in a working state, the low-frequency channel or the medium-high frequency channel is communicated with the excitation source.

Specifically, the connection point of the medium-high frequency channel and the antenna body forms an antenna feed point; the antenna bodies on two sides of the antenna feed point respectively form a first resonance end and a second resonance end.

Specifically, when the antenna body operates in the low-frequency channel, the coupling slot is used for coupling out ultrahigh frequency;

when the antenna body works in the medium-high frequency channel, the coupling gap is used for coupling out ultrahigh frequency, and the first resonance end and the second resonance end are used for generating different resonances.

Specifically, the frequency switching channel comprises a low-frequency matching network, a medium-high frequency matching network and a selector switch;

the low-frequency matching network and the selector switch form the low-frequency channel;

the medium-high frequency matching network and the change-over switch form the medium-high frequency channel.

Specifically, the low-frequency matching network comprises a low-frequency modulation circuit, and the low-frequency modulation circuit and the antenna body realize frequency sweeping from 700-960 MHz;

the medium-high frequency matching network comprises a medium-high frequency modulation circuit, and the medium-high frequency modulation circuit realizes the frequency sweep from 1710-2690 MHz.

Specifically, the low-frequency modulation circuit and the antenna body form caliber tuning, and the frequency sweeping from 700-960 MHz is realized.

Specifically, the length of the antenna body is not less than 2 mm.

Optionally, the coupling gap is between 1.1mm-1.3 mm.

In addition, in order to achieve the above object, the present invention further provides a three-segment mobile terminal, which includes the antenna device as described above.

The antenna device and the three-section mobile terminal provided by the invention are easy to debug and good in antenna performance, belong to a full-network antenna, can effectively solve the problem that the medium-high frequency cannot be considered in a metal middle frame mobile phone in the prior art, and are particularly suitable for the mobile terminal with the front shell and the rear shell of glass.

Drawings

Fig. 1 is a schematic diagram of a hardware structure of an optional mobile terminal for implementing various embodiments of the present invention;

FIG. 2 is a diagram of a wireless communication system for the mobile terminal shown in FIG. 1;

fig. 3 is a schematic diagram of a hardware structure of an antenna apparatus according to an embodiment of the present invention;

fig. 4 is a schematic hardware structure diagram of an antenna device according to an embodiment of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.

The terminal may be implemented in various forms. For example, the terminal described in the present invention may include a mobile terminal such as a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a Personal Digital Assistant (PDA), a Portable Media Player (PMP), a navigation device, a wearable device, a smart band, a pedometer, and the like, and a fixed terminal such as a Digital TV, a desktop computer, and the like.

The following description will be given by way of example of a mobile terminal, and it will be understood by those skilled in the art that the construction according to the embodiment of the present invention can be applied to a fixed type terminal, in addition to elements particularly used for mobile purposes.

Referring to fig. 1, which is a schematic diagram of a hardware structure of a mobile terminal for implementing various embodiments of the present invention, the mobile terminal 100 may include: RF (Radio Frequency) unit 101, WiFi module 102, audio output unit 103, a/V (audio/video) input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108, memory 109, processor 110, and power supply 111. Those skilled in the art will appreciate that the mobile terminal architecture shown in fig. 1 is not intended to be limiting of mobile terminals, which may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

The following describes each component of the mobile terminal in detail with reference to fig. 1:

the radio frequency unit 101 may be configured to receive and transmit signals during information transmission and reception or during a call, and specifically, receive downlink information of a base station and then process the downlink information to the processor 110; in addition, the uplink data is transmitted to the base station. Typically, the radio frequency unit 101 includes, but is not limited to, an antenna arrangement, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc. In addition, the radio frequency unit 101 can also communicate with a network and other devices through wireless communication. The wireless communication may use any communication standard or protocol, including but not limited to GSM (Global System for Mobile communications), GPRS (General Packet Radio Service), CDMA2000(Code Division Multiple Access 2000), WCDMA (Wideband Code Division Multiple Access), TD-SCDMA (Time Division-Synchronous Code Division Multiple Access), FDD-LTE (Frequency Division duplex Long Term Evolution), and TDD-LTE (Time Division duplex Long Term Evolution).

WiFi belongs to short-distance wireless transmission technology, and the mobile terminal can help a user to receive and send e-mails, browse webpages, access streaming media and the like through the WiFi module 102, and provides wireless broadband internet access for the user. Although fig. 1 shows the WiFi module 102, it is understood that it does not belong to the essential constitution of the mobile terminal, and may be omitted entirely as needed within the scope not changing the essence of the invention.

The audio output unit 103 may convert audio data received by the radio frequency unit 101 or the WiFi module 102 or stored in the memory 109 into an audio signal and output as sound when the mobile terminal 100 is in a call signal reception mode, a call mode, a recording mode, a voice recognition mode, a broadcast reception mode, or the like. Also, the audio output unit 103 may also provide audio output related to a specific function performed by the mobile terminal 100 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 103 may include a speaker, a buzzer, and the like.

The a/V input unit 104 is used to receive audio or video signals. The a/V input Unit 104 may include a Graphics Processing Unit (GPU) 1041 and a microphone 1042, the Graphics processor 1041 Processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 106. The image frames processed by the graphic processor 1041 may be stored in the memory 109 (or other storage medium) or transmitted via the radio frequency unit 101 or the WiFi module 102. The microphone 1042 may receive sounds (audio data) via the microphone 1042 in a phone call mode, a recording mode, a voice recognition mode, or the like, and may be capable of processing such sounds into audio data. The processed audio (voice) data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 101 in case of a phone call mode. The microphone 1042 may implement various types of noise cancellation (or suppression) algorithms to cancel (or suppress) noise or interference generated in the course of receiving and transmitting audio signals.

The mobile terminal 100 also includes at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that can adjust the brightness of the display panel 1061 according to the brightness of ambient light, and a proximity sensor that can turn off the display panel 1061 and/or a backlight when the mobile terminal 100 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when stationary, and can be used for applications of recognizing the posture of a mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer and tapping), and the like; as for other sensors such as a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which can be configured on the mobile phone, further description is omitted here.

The display unit 106 is used to display information input by a user or information provided to the user. The Display unit 106 may include a Display panel 1061, and the Display panel 1061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 107 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the mobile terminal. Specifically, the user input unit 107 may include a touch panel 1071 and other input devices 1072. The touch panel 1071, also referred to as a touch screen, may collect a touch operation performed by a user on or near the touch panel 1071 (e.g., an operation performed by the user on or near the touch panel 1071 using a finger, a stylus, or any other suitable object or accessory), and drive a corresponding connection device according to a predetermined program. The touch panel 1071 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 110, and can receive and execute commands sent by the processor 110. In addition, the touch panel 1071 may be implemented in various types, such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 1071, the user input unit 107 may include other input devices 1072. In particular, other input devices 1072 may include, but are not limited to, one or more of a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like, and are not limited to these specific examples.

Further, the touch panel 1071 may cover the display panel 1061, and when the touch panel 1071 detects a touch operation thereon or nearby, the touch panel 1071 transmits the touch operation to the processor 110 to determine the type of the touch event, and then the processor 110 provides a corresponding visual output on the display panel 1061 according to the type of the touch event. Although the touch panel 1071 and the display panel 1061 are shown in fig. 1 as two separate components to implement the input and output functions of the mobile terminal, in some embodiments, the touch panel 1071 and the display panel 1061 may be integrated to implement the input and output functions of the mobile terminal, and is not limited herein.

The interface unit 108 serves as an interface through which at least one external device is connected to the mobile terminal 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 108 may be used to receive input (e.g., data information, power, etc.) from external devices and transmit the received input to one or more elements within the mobile terminal 100 or may be used to transmit data between the mobile terminal 100 and external devices.

The memory 109 may be used to store software programs as well as various data. The memory 109 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 109 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 110 is a control center of the mobile terminal, connects various parts of the entire mobile terminal using various interfaces and lines, and performs various functions of the mobile terminal and processes data by operating or executing software programs and/or modules stored in the memory 109 and calling data stored in the memory 109, thereby performing overall monitoring of the mobile terminal. Processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 110.

The mobile terminal 100 may further include a power supply 111 (e.g., a battery) for supplying power to various components, and preferably, the power supply 111 may be logically connected to the processor 110 via a power management system, so as to manage charging, discharging, and power consumption management functions via the power management system.

Although not shown in fig. 1, the mobile terminal 100 may further include a bluetooth module or the like, which is not described in detail herein.

In order to facilitate understanding of the embodiments of the present invention, a communication network system on which the mobile terminal of the present invention is based is described below.

Referring to fig. 2, fig. 2 is an architecture diagram of a communication Network system according to an embodiment of the present invention, where the communication Network system is an LTE system of a universal mobile telecommunications technology, and the LTE system includes a UE (User Equipment) 201, an E-UTRAN (Evolved UMTS Terrestrial Radio Access Network) 202, an EPC (Evolved Packet Core) 203, and an IP service 204 of an operator, which are in communication connection in sequence.

Specifically, the UE201 may be the terminal 100 described above, and is not described herein again.

The E-UTRAN202 includes eNodeB2021 and other eNodeBs 2022, among others. Among them, the eNodeB2021 may be connected with other eNodeB2022 through backhaul (e.g., X2 interface), the eNodeB2021 is connected to the EPC203, and the eNodeB2021 may provide the UE201 access to the EPC 203.

The EPC203 may include an MME (Mobility Management Entity) 2031, an HSS (Home Subscriber Server) 2032, other MMEs 2033, an SGW (Serving gateway) 2034, a PGW (PDN gateway) 2035, and a PCRF (Policy and Charging Rules Function) 2036, and the like. The MME2031 is a control node that handles signaling between the UE201 and the EPC203, and provides bearer and connection management. HSS2032 is used to provide registers to manage functions such as home location register (not shown) and holds subscriber specific information about service characteristics, data rates, etc. All user data may be sent through SGW2034, PGW2035 may provide IP address assignment for UE201 and other functions, and PCRF2036 is a policy and charging control policy decision point for traffic data flow and IP bearer resources, which selects and provides available policy and charging control decisions for a policy and charging enforcement function (not shown).

The IP services 204 may include the internet, intranets, IMS (IP Multimedia Subsystem), or other IP services, among others.

Although the LTE system is described as an example, it should be understood by those skilled in the art that the present invention is not limited to the LTE system, but may also be applied to other wireless communication systems, such as GSM, CDMA2000, WCDMA, TD-SCDMA, and future new network systems.

Based on the above-mentioned mobile terminal hardware structure and communication network system, various embodiments of the present invention are proposed.

As shown in fig. 3, an embodiment of the present invention provides an antenna device, where the antenna device is used in a mobile terminal with a three-section metal housing, and the antenna device includes an antenna body, a coupling slot, an excitation source, and a frequency switching channel;

The antenna device realized by the antenna body, the coupling slot, the excitation source and the frequency switching channel in the embodiment of the invention is easy to debug, has good antenna performance, belongs to a full-network antenna, and can effectively solve the problem that the medium-high frequency cannot be considered in the metal middle frame mobile phone in the prior art.

The three-section metal shell in the embodiment of the invention specifically comprises two metal frames and a metal middle frame, wherein the metal frames are in a quadrilateral shape with two chamfers, and the two chamfers are far away from one side of the metal frames.

At present, generally, when a user selects a mobile phone, the performance and the appearance of the mobile phone are mainly considered, and the three-section metal-shell mobile phone is more and more popular due to the beautiful appearance, but the antenna in the existing three-section metal-shell mobile phone cannot give consideration to both medium and high frequencies, the debugging is complex, and the performance of the antenna is poor, so that how to arrange the antenna in the three-section metal-shell mobile phone becomes a problem to be solved urgently.

Tuning of the antenna also presents significant challenges due to metal housing limitations. For example, in the prior art, a common plastic component/circuit board is generally integrated by LDS (Laser Direct Structuring) technology with functions of electrical interconnection, component supporting, supporting and protection of plastic housing, and functions of shielding and antenna generated by mechanical entity and conductive pattern combination. But the LDS technology printing brings inconvenience to antenna debugging. In particular, when a three-piece metal-encased cell phone is held by a user, the antenna efficiency is significantly reduced.

In the embodiment of the invention, the metal frame is directly used as the antenna body, and the full-network antenna is realized through the antenna body, the coupling gap, the excitation source and the frequency switching channel, so that full-frequency-band frequency sweeping is realized, the performance is good, and meanwhile, during debugging, the debugging of the antenna can be completed through the antenna body, the coupling gap, the excitation source and the frequency switching channel, thereby simplifying the debugging process of the antenna and facilitating the debugging of the antenna.

On the basis of the above-described embodiment, a modified embodiment of the above-described embodiment is further proposed, and it is to be noted herein that, in order to make the description brief, only the differences from the above-described embodiment are described in each modified embodiment.

In one embodiment of the invention, the antenna device is used for a mobile terminal with a three-section metal shell, and comprises an antenna body, a coupling slot, an excitation source and a frequency switching channel;

The frequency switching channel is a low-frequency channel and a medium-high frequency channel which are arranged in parallel; when the antenna body is in a working state, the low-frequency channel or the medium-high frequency channel is communicated with the excitation source. That is to say, in the embodiment of the present invention, the antenna body may alternatively be communicated with the excitation source through a low frequency channel or a medium-high frequency channel, so as to be in a working state.

When the antenna body works in a low-frequency channel, the coupling gap can be coupled out of ultrahigh frequency, so that different combinations of low-frequency and ultrahigh-frequency CA (Carrier Aggregation) can be realized.

When the antenna body works in the middle-high frequency channel, the antenna body can generate different resonances, and the coupling gap can be coupled out of ultrahigh frequency, so that various CA combinations of medium frequency + medium frequency, medium frequency + ultrahigh frequency can be realized, and a full-network antenna can be realized.

In another embodiment of the present invention, the antenna device is used for a mobile terminal with a three-section metal housing, and the antenna device includes an antenna body, a coupling slot, an excitation source and a frequency switching channel;

The frequency switching channel is a low-frequency channel and a medium-high frequency channel which are arranged in parallel; when the antenna body is in a working state, the low-frequency channel or the medium-high frequency channel is communicated with the excitation source.

That is, when the antenna body operates in the low-frequency channel, the coupling slot is used for coupling out ultrahigh frequency;

The antenna feed point of the embodiment of the invention is very important to be arranged, and the position of the antenna feed point influences the performance of the antenna.

For example, the antenna feed point is located at three-eighths, three-seventeents, two-sixteents, two-fifths, etc. of the antenna body.

It should be noted that, taking the three-section metal housing as an example, the connection point of the low frequency channel and the antenna body is located on the left side of the antenna feed point.

In yet another embodiment of the present invention, the antenna device is used for a mobile terminal with a three-section metal housing, and the antenna device includes an antenna body, a coupling slot, an excitation source and a frequency switching channel;

Further, as shown in fig. 4, the frequency switching channel includes a low frequency matching network, a medium frequency matching network, and a switch;

The change-over switch can be an SPDT single-pole double-throw switch.

Specifically, the frequency switching channel is a low-frequency channel and a medium-high frequency channel which are arranged in parallel; when the antenna body is in a working state, the low-frequency channel or the medium-high frequency channel is communicated with the excitation source.

The connection point of the medium-high frequency channel and the antenna body forms an antenna feed point; the antenna bodies on two sides of the antenna feed point respectively form a first resonance end and a second resonance end.

When the antenna body works in the low-frequency channel, the coupling slot is used for coupling out ultrahigh frequency;

The length a of the antenna body is not less than 2mm, and the longer the antenna body is, the wider the bandwidth of the antenna resonance is.

The low-frequency matching network comprises a low-frequency modulation circuit, and the low-frequency modulation circuit and the antenna body realize frequency sweeping from 700-960 MHz;

Furthermore, the low-frequency modulation circuit and the antenna body form caliber tuning, and the frequency sweeping from 700-960 MHz is realized.

And broken seams are arranged between the coupling end and the resonance end and between the coupling end and the antenna body.

Wherein the coupling gap is between 1.1mm and 1.3 mm; in the embodiment of the invention, the coupling gap is 1.2 mm.

The smaller the width of the broken seam is, the higher the debugging difficulty of the antenna is, thereby affecting the performance of the antenna.

The gap can not be set between 1.1mm and 1.3mm in the prior art, and the gap width is set between 1.1mm and 1.3mm based on the specific structure of the antenna device in the embodiment of the invention, so that the mobile terminal with the metal middle frame is more attractive, and the selection of a user is influenced.

Furthermore, the frequency switching channel is specifically a low-frequency channel and a medium-high frequency channel which are arranged in parallel; when the antenna body is in a working state, the low-frequency channel or the medium-high frequency channel is communicated with the excitation source.

As a specific application example, the working principle of the antenna device in the embodiment of the present invention is briefly described.

The embodiment of the invention provides an antenna device, which is used for a mobile terminal with a three-section metal shell and comprises an antenna body, a coupling gap, an excitation source and a frequency switching channel;

Furthermore, the connection point of the medium-high frequency channel and the antenna body forms an antenna feed point; the antenna bodies on two sides of the antenna feed point respectively form a first resonance end and a second resonance end.

Specifically, as shown in fig. 4, the frequency switching channel includes a low frequency matching network, a medium frequency matching network, and a high frequency switching switch;

The change-over switch can be an SPDT single-pole double-throw switch.

Optionally, a gap is provided between each of the coupling end and the antenna body and between each of the resonance end and the antenna body.

The working principle is as follows:

firstly, the length of the antenna body is recommended to be larger than 2mm, and the longer the antenna body is, the wider the bandwidth of the antenna resonance is;

the antenna switch adopts SPDT single-pole double-throw, a channel 1 is a low-frequency channel, and a channel 2 is a medium-high frequency channel;

when the antenna works in the channel 1, the channel 2 is disconnected, the low-frequency modulation circuit is utilized, the self length of the antenna body is utilized to be combined with the frequency modulation circuit to realize the caliber tuning technology, and therefore the frequency sweeping of 700-960 MHz can be realized;

when the frequency modulation circuit works in the channel 2, the frequency sweep from 1710-2690 MHz can be realized by using the medium-high frequency modulation circuit 2;

when the antenna channel 1 works, the low-frequency state exists, and simultaneously, due to the fact that coupling triple frequency exists in the coupling gap, different combinations of low-frequency and ultrahigh-frequency CA can be achieved;

when the antenna works in the channel 2, the resonance ends on the two sides of the antenna feed point generate different resonances at 1/4 wavelength respectively, and two or more resonances can be formed by coupling out the resonances in combination with the antenna slot; can realize various CA combinations of medium frequency + medium frequency, medium frequency + ultrahigh frequency.

The antenna device in the embodiment of the invention belongs to a full-network antenna, has good antenna performance and is easy to debug, and can be used for a metal middle frame mobile terminal with a glass front shell and a glass rear shell.

Based on the antenna device in the foregoing embodiments, an embodiment of the present invention further provides a three-segment mobile terminal, where the mobile terminal includes the antenna device in any of the foregoing embodiments.

The three-section type mobile terminal provided by the embodiment of the invention is provided with a three-section type metal shell, wherein the three-section type metal shell specifically comprises two metal frames and a metal middle frame, the metal frames are in a quadrilateral shape with two chamfers, and the two chamfers are far away from one side of the metal frames.

In detail, the antenna device is used for a mobile terminal with a three-section metal shell, and comprises an antenna body, a coupling slot, an excitation source and a frequency switching channel;

In an embodiment of the present invention, the frequency switching channel is specifically a low-frequency channel and a middle-high frequency channel which are arranged in parallel; when the antenna body is in a working state, the low-frequency channel or the medium-high frequency channel is communicated with the excitation source.

Specifically, when the antenna body works in the low-frequency channel, the coupling slot is used for coupling out ultrahigh frequency;

Specifically, the length of the antenna body is not less than 2 mm.

In another embodiment of the invention, the coupling gap is between 1.1mm and 1.3 mm.

The working principle of the mobile terminal in the embodiment of the invention is described by taking a specific application example.

The mobile terminal belongs to a mobile terminal with a three-section metal shell and comprises an antenna device, wherein the antenna device comprises an antenna body, a coupling gap, an excitation source and a frequency switching channel;

The change-over switch can be an SPDT single-pole double-throw switch.

The working principle is as follows:

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An antenna device is characterized in that the antenna device is used for a mobile terminal with a three-section metal shell and comprises an antenna body, a coupling slot, an excitation source and a frequency switching channel;

the coupling gap is arranged between the metal middle frame and the antenna body and ranges from 1.1mm to 1.3 mm;

the antenna body is communicated with the excitation source through a frequency switching channel;

the frequency switching channel comprises a low-frequency matching network, a medium-high frequency matching network and a selector switch;

the low-frequency matching network and the change-over switch form a low-frequency channel;

the medium-high frequency matching network and the change-over switch form a medium-high frequency channel;

the connection point of the medium-high frequency channel and the antenna body forms an antenna feed point; the antenna bodies on the two sides of the antenna feed point respectively form a first resonance end and a second resonance end;

2. The antenna device according to claim 1, characterized in that the frequency switching channels are in particular low-frequency channels and medium-high frequency channels arranged in parallel; when the antenna body is in a working state, the low-frequency channel or the medium-high frequency channel is communicated with the excitation source.

3. The antenna device of claim 1, wherein the low frequency matching network comprises a low frequency modulation circuit, the low frequency modulation circuit and the antenna body implement a frequency sweep from 700-960 MHz;

4. The antenna device as claimed in claim 3, wherein the low frequency tuning circuit and the antenna body form an aperture tuning to enable a frequency sweep from 700 to 960 MHz.

5. The antenna device according to claim 3 or 4, wherein the antenna body length is not less than 2 mm.

6. A three-part mobile terminal, characterized in that it comprises an antenna device according to any of claims 1-5.