CN106229627B - Antenna assembly and mobile terminal - Google Patents
Antenna assembly and mobile terminal Download PDFInfo
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- CN106229627B CN106229627B CN201610875352.0A CN201610875352A CN106229627B CN 106229627 B CN106229627 B CN 106229627B CN 201610875352 A CN201610875352 A CN 201610875352A CN 106229627 B CN106229627 B CN 106229627B
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- slot antenna
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- metal frame
- slot
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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Abstract
The present disclosure provides an antenna assembly for a mobile terminal, including a first slot antenna and a second slot antenna respectively disposed at sides of the mobile terminal, and at least a portion of a metal bezel disposed between the first slot antenna and the second slot antenna. Wherein the first slot antenna has a first feed point and the second slot antenna has a second feed point. At least part of the metal frame is coupled and connected with the first feeding point and the second feeding point respectively. At least part of the metal frame is coupled between the first slot antenna and the second slot antenna, and the metal frame is used as a decoupling unit, so that the isolation of the two antenna units is improved. The metal frame is used as a decoupling unit, so that the internal design space of the circuit board is not occupied, and the design space is saved.
Description
Technical Field
The disclosure belongs to the technical field of communication, and relates to an antenna assembly and a mobile terminal.
Background
One of the slot antennas is an antenna scheme suitable for a mobile phone with a metal frame, and because the slot antenna uses a mode of slotting in the metal plane to construct a radiation unit, the metal frame does not need to be cut off. However, in the case of at least two slot antennas having the same operating frequency band, the radiation energy between the slot antennas can form stronger coupling through the floors, and therefore, a larger design space or an additional isolation measure is required to improve the isolation of the slot antennas.
Alternative methods to improve isolation are:
first, a slot in the floor between the two slot antennas cuts off the coupled current path, thereby improving isolation.
And secondly, connecting a decoupling circuit to improve the isolation between the antenna units.
Both of the above methods need to occupy the internal design space of the circuit board between the two slot antennas, and are not suitable for application to mobile communication devices with high integration level.
Disclosure of Invention
In view of the above, the present disclosure provides an antenna assembly and a mobile terminal for improving isolation between slot antennas.
According to a first aspect of the embodiments of the present disclosure, there is provided an antenna assembly for a mobile terminal, including a first slot antenna and a second slot antenna respectively disposed at sides of the mobile terminal, and at least a part of a metal bezel located between the first slot antenna and the second slot antenna; wherein the first slot antenna has a first feed point and the second slot antenna has a second feed point;
at least part of the metal frame is respectively coupled with the first feeding point and the second feeding point.
In an embodiment, two ends of the at least part of the metal frame extend to the slots of the first slot antenna and the second slot antenna respectively.
In an embodiment, the first slot antenna and the second slot antenna have at least a part of the same operating frequency band.
In an embodiment, the metal frame is set as a third slot antenna, and an operating frequency band of the third slot antenna is different from operating frequency bands of the first slot antenna and the second slot antenna.
In an embodiment, the first slot antenna and the second slot antenna are symmetrically arranged on two sides of the mobile terminal.
In an embodiment, the first slot antenna and the second slot antenna are respectively connected with the metal frame through direct coupling.
In an embodiment, the first slot antenna and the second slot antenna are respectively connected with the metal frame through resistance-capacitance coupling.
According to a second aspect of the embodiments of the present disclosure, there is provided a mobile terminal, including:
a processor;
a memory for storing processor-executable instructions;
wherein the mobile terminal further comprises an antenna assembly.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
at least part of the metal frame is coupled between the first slot antenna and the second slot antenna, and the metal frame is used as a decoupling unit, so that the isolation of the two antenna units is improved.
The metal frame is used as a decoupling unit, so that the internal design space of the circuit board is not occupied, and the design space of the mobile terminal is saved.
Drawings
Fig. 1 is a schematic diagram of an antenna assembly shown in an exemplary embodiment of the present disclosure.
Fig. 2 is a diagram illustrating test results when the first slot antenna and the second slot antenna are not connected to a metal bezel according to an exemplary embodiment of the present disclosure.
Fig. 3 is a diagram illustrating test results when a first slot antenna and a second slot antenna are connected to a metal bezel according to an exemplary embodiment of the present disclosure.
Fig. 4 is a schematic diagram illustrating a test result of a first slot antenna and a second slot antenna connected to a metal frame and the metal frame is set as a third slot antenna according to an exemplary embodiment of the present disclosure.
Fig. 5 is a coupling-mode connection diagram of an antenna assembly shown in an exemplary embodiment of the present disclosure.
Fig. 6 is a block diagram of a mobile terminal showing an antenna assembly according to an exemplary embodiment of the present disclosure.
Wherein, the first slot antenna 10; a first feeding point 11; a second slot antenna 20; a second feeding point 21; a resistance-capacitance line 22; a metal frame 30; a third slot antenna 31; a mobile terminal 40; a processing component 402; a memory 404; a power supply component 406; a multimedia component 408; an audio component 410; an input/output (I/O) interface 412; a sensor assembly 414; a communication component 416; a processor 420.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
As shown in fig. 1, an antenna assembly for a mobile terminal according to an exemplary embodiment is shown, which includes a first slot antenna 10 and a second slot antenna 20 respectively disposed at sides of the mobile terminal, and at least a portion of a metal bezel 30 located between the first slot antenna 10 and the second slot antenna 20; wherein the first slot antenna 10 has a first feeding point 11, and the second slot antenna 20 has a second feeding point 21; at least part of the metal frame 30 is coupled to the first feeding point 11 and the second feeding point 21, respectively.
When the first feeding point 11 of the first slot antenna 10 and the second feeding point 21 of the second slot antenna 20 are connected to at least a portion of the metal frame 30, respectively, a current coupling path may be formed on the metal frame 30. Since the radiation energy of the first slot antenna 10 and the second slot antenna 20 on the mobile terminal can form a strong coupling through the floor, the energy coupled on the metal frame 30 and the energy coupled through the floor have a large phase difference, and the energy of the two can cancel each other out, thereby improving the isolation between the first slot antenna 10 and the second slot antenna 20. The metal frame 30 of the mobile terminal is used as a decoupling unit, so that the isolation of the two antenna units can be improved under the condition of not occupying the design space of a circuit board in the mobile terminal, and the design space is saved.
In an embodiment, two ends of the at least part of the metal frame 30 extend to the slots of the first slot antenna 10 and the second slot antenna 20, respectively.
In one embodiment, the first slot antenna 10 and the second slot antenna 20 have at least partially the same operating frequency band.
In an embodiment, the metal frame 30 is configured as a third slot antenna 31, and an operating frequency band of the third slot antenna 31 is different from an operating frequency band of the first slot antenna 10 and an operating frequency band of the second slot antenna 20.
In one embodiment, the first slot antenna 10 and the second slot antenna 20 are symmetrically disposed on two sides of the mobile terminal.
In one embodiment, the first slot antenna 10 and the second slot antenna 20 are respectively connected to the metal frame 30 through direct coupling. Both ends of the metal frame 30 are connected to the first slot antenna 10 and the second slot antenna 20 through the feeding lines, respectively, to form a current coupling path.
As shown in fig. 5, in an embodiment, the first slot antenna 10 and the second slot antenna 20 are respectively connected to the metal frame 30 through a resistance-capacitance coupling. Both ends of the metal frame 30 are connected to the first slot antenna 10 and the second slot antenna 20 through the rc lines 22 having resistive elements and capacitive elements, respectively, to form a current coupling path and extend the coupling path.
To this end, the antenna module according to the embodiment of the present disclosure may improve the isolation between the first slot antenna 10 and the second slot antenna 20. The metal frame 30 can also be used as other antenna structures to realize the multiplexing of the structures.
In order to more clearly illustrate the advantageous technical effects of the embodiments of the present disclosure, the following describes in detail the advantageous technical effects of the embodiments of the present disclosure with reference to fig. 2 to 4.
Fig. 2 is a diagram illustrating test results of input characteristics when the first slot antenna 10 and the second slot antenna 20 are not connected to the metal bezel 30 on the mobile terminal according to an exemplary embodiment.
As shown in fig. 2, the horizontal axis represents the operating frequencies of the first and second slot antennas 10 and 20, and the vertical axis represents the isolation between the first and second slot antennas 10 and 20 in decibels (dB). In the figure, a solid line indicates a return loss curve of the first slot antenna 10, a broken line indicates a return loss curve of the second slot antenna 20, and a line of a plurality of dots indicates an isolation curve of the first slot antenna 10 and the second slot antenna 20.
Both the first slot antenna 10 and the second slot antenna 20 can form a good resonance characteristic around the frequency of 2.4 GHz. The isolation between the first slot antenna 10 and the second slot antenna 20 is about-7 dB for this operating frequency.
Fig. 3 is a diagram illustrating test results of input characteristics when the first slot antenna 10 and the second slot antenna 20 are connected to the metal bezel 30 on the mobile terminal according to an exemplary embodiment.
As shown in fig. 3, the horizontal axis represents the operating frequencies of the first and second slot antennas 10 and 20, and the vertical axis represents the isolation between the first and second slot antennas 10 and 20 in decibels (dB). In the figure, a solid line indicates a return loss curve of the first slot antenna 10, a broken line indicates a return loss curve of the second slot antenna 20, and a line of a plurality of dots indicates an isolation curve of the first slot antenna 10 and the second slot antenna 20.
After the first slot antenna 10 and the second slot antenna 20 are coupled to the metal frame 30, the first slot antenna 10 and the second slot antenna 20 can both form a good resonance characteristic around a frequency of 2.4 GHz. The isolation between the first slot antenna 10 and the second slot antenna 20 is about-15 dB for this operating frequency.
Fig. 4 is a diagram illustrating a test result of the input characteristic of the mobile terminal in which the first slot antenna 10 and the second slot antenna 20 are connected to the metal frame 30 and the metal frame 30 is set as the third slot antenna 31 according to an exemplary embodiment.
As shown in fig. 4, the horizontal axis represents the operating frequencies of the first and second slot antennas 10 and 20, and the vertical axis represents the isolation between the first and second slot antennas 10 and 20 in decibels (dB). In the figure, a solid line indicates a return loss curve of the first slot antenna 10, a broken line indicates a return loss curve of the second slot antenna 20, a triangular line indicates a return loss curve of the third slot antenna 31, and a line with a plurality of dots indicates an isolation curve of the first slot antenna 10 and the second slot antenna 20.
When the metal frame 30 is coupled to the first slot antenna 10 and the second slot antenna 20 and the metal frame 30 is the third slot antenna 31, the first slot antenna 10 and the second slot antenna 20 can both have a good resonance characteristic at a frequency of 2.4GHz, and the third slot antenna 31 can both have a good resonance characteristic at a frequency of 2 GHz. The isolation between the first slot antenna 10 and the second slot antenna 20 is about-15 dB for this operating frequency.
As can be seen from the isolation data obtained in fig. 2 and fig. 3, the metal frame 30 is added between the first and second antenna units with the same or similar operating frequencies on the mobile terminal, and the metal frame 30 is coupled to the two antenna units to serve as a decoupling unit, so that the isolation between the two antenna units can be improved. Meanwhile, the metal frame 30 is used as a part of the mobile terminal, does not occupy the design space of the circuit board, and has high utilization rate.
As can be seen from the isolation data obtained in fig. 3 and fig. 4, the metal frame 30 is added between the first and second antenna units with the same or similar operating frequencies on the mobile terminal, and the metal frame 30 is used as a third antenna unit operating in different frequency bands. The metal frame 30 is coupled to the two antenna units to serve as a decoupling unit, so that the isolation between the two antenna units is improved. Meanwhile, the metal frame 30 as the third antenna unit has little influence on the input characteristics of the first and second antenna units.
Therefore, the metal frame 30 of the mobile device is used as a decoupling unit, and the isolation between the two antenna units can be improved without occupying the design space of the circuit board. Moreover, the metal frame 30 is used as other antenna structures, and works in different frequency bands with the original two antenna units, so that the multiplexing of the structure can be realized under the condition of improving the isolation, the signal receiving and transmitting range of the mobile device is expanded, and the space of the mobile device is saved.
A mobile terminal, said mobile terminal comprising: a processor; a memory for storing processor-executable instructions; wherein the mobile terminal further comprises an antenna assembly.
Fig. 6 is a block diagram illustrating a mobile terminal 40 according to an example embodiment. For example, the mobile terminal 40 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, and the like.
Referring to fig. 6, the mobile terminal 40 may include one or more of the following components: processing components 402, memory 404, power components 406, multimedia components 408, audio components 410, input/output (I/O) interfaces 412, sensor components 414, and communication components 416.
The processing component 402 generally controls overall operation of the mobile terminal 40, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing element 402 may include one or more processors 420 to execute instructions to perform all or part of the steps of the methods described above. Further, the processing component 402 can include one or more modules that facilitate interaction between the processing component 402 and other components. For example, the processing component 402 can include a multimedia module to facilitate interaction between the multimedia component 408 and the processing component 402.
The memory 404 is configured to store various types of data to support operations at the device 400. Examples of such data include instructions for any application or method operating on the mobile terminal 40, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 404 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
The power components 406 provide power to the various components of the mobile terminal 40. The power components 406 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the mobile terminal 40.
The multimedia component 408 includes a screen providing an output interface between the mobile terminal 40 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 408 includes a front facing camera and/or a rear facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the device 400 is in an operational mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.
The audio component 410 is configured to output and/or input audio signals. For example, the audio component 410 may include a Microphone (MIC) configured to receive external audio signals when the mobile terminal 40 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 404 or transmitted via the communication component 416. In some embodiments, audio component 410 also includes a speaker for outputting audio signals.
The I/O interface 412 provides an interface between the processing component 402 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor component 414 includes one or more sensors for providing various aspects of state assessment for the mobile terminal 40. For example, the sensor component 414 may detect an open/closed state of the device 400, the relative positioning of components, such as a display and keypad of the mobile terminal 40, the sensor component 414 may also detect a change in the position of the mobile terminal 40 or a component of the mobile terminal 40, the presence or absence of user contact with the mobile terminal 40, orientation or acceleration/deceleration of the mobile terminal 40, and a change in the temperature of the mobile terminal 40. The sensor assembly 414 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 414 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 414 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 416 is configured to facilitate communications between the mobile terminal 40 and other devices in a wired or wireless manner. The mobile terminal 40 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 416 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 416 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the mobile terminal 40 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.
In an exemplary embodiment, a non-transitory computer readable storage medium is also provided that includes instructions, such as the memory 404, that are executable by the processor 420 of the mobile terminal 40 to perform the above-described method. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (6)
1. An antenna assembly for a mobile terminal, comprising a first slot antenna and a second slot antenna respectively arranged at the side of the mobile terminal, and at least a part of a metal frame positioned between the first slot antenna and the second slot antenna; the first slot antenna is provided with a first feeding point, the second slot antenna is provided with a second feeding point, and the first slot antenna and the second slot antenna are both provided with radiating elements formed by slotting in the metal plane;
at least part of the metal frame is coupled and connected with the first feeding point and the second feeding point respectively, wherein two ends of the metal frame are connected to a first slot antenna and a second slot antenna through resistance-capacitance lines respectively, and energy coupled on the metal frame by the first slot antenna and the second slot antenna has large phase difference with energy formed by the first slot antenna and the second slot antenna through floor coupling and is offset with each other, so that the isolation between the first slot antenna and the second slot antenna is improved.
2. The antenna assembly of claim 1, wherein two ends of the at least a portion of the metal bezel extend to the slots of the first slot antenna and the second slot antenna, respectively.
3. The antenna assembly of claim 1, wherein the first slot antenna and the second slot antenna are at least partially in the same operating frequency band.
4. The antenna assembly of claim 3, wherein the metal frame is configured as a third slot antenna, and an operating frequency band of the third slot antenna is different from operating frequency bands of the first slot antenna and the second slot antenna.
5. The antenna assembly of claim 1, wherein the first slot antenna and the second slot antenna are symmetrically disposed on two sides of the mobile terminal.
6. A mobile terminal, characterized in that said mobile terminal comprises:
a processor;
a memory for storing processor-executable instructions;
wherein the mobile terminal further comprises an antenna assembly according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610875352.0A CN106229627B (en) | 2016-09-30 | 2016-09-30 | Antenna assembly and mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610875352.0A CN106229627B (en) | 2016-09-30 | 2016-09-30 | Antenna assembly and mobile terminal |
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| CN106229627A CN106229627A (en) | 2016-12-14 |
| CN106229627B true CN106229627B (en) | 2020-06-02 |
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| CN201610875352.0A Active CN106229627B (en) | 2016-09-30 | 2016-09-30 | Antenna assembly and mobile terminal |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257017B (en) * | 2017-05-31 | 2019-10-18 | 维沃移动通信有限公司 | A kind of terminal multi-antenna structure and mobile terminal |
| US10784572B2 (en) * | 2017-06-02 | 2020-09-22 | Apple Inc. | Electronic device with speaker and antenna isolation |
| CN108987906B (en) * | 2018-07-24 | 2021-01-08 | 维沃移动通信有限公司 | Terminal equipment |
| CN108987905B (en) * | 2018-07-24 | 2021-01-08 | 维沃移动通信有限公司 | Terminal equipment |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8085202B2 (en) * | 2009-03-17 | 2011-12-27 | Research In Motion Limited | Wideband, high isolation two port antenna array for multiple input, multiple output handheld devices |
| TWI495197B (en) * | 2011-10-11 | 2015-08-01 | Univ Southern Taiwan | Monopole slot antenna of multiple-input and multiple-output with good isolation degree |
| GB2500209B (en) * | 2012-03-13 | 2016-05-18 | Microsoft Technology Licensing Llc | Antenna isolation using a tuned ground plane notch |
| TWI562456B (en) * | 2013-02-01 | 2016-12-11 | Chiun Mai Comm Systems Inc | Antenna assembly and wireless communication device employing same |
| CN204407469U (en) * | 2014-12-05 | 2015-06-17 | 广东欧珀移动通信有限公司 | Mobile terminal |
| CN204885437U (en) * | 2015-07-29 | 2015-12-16 | 瑞声精密制造科技(常州)有限公司 | Antenna system |
| CN205081217U (en) * | 2015-10-23 | 2016-03-09 | 广东欧珀移动通信有限公司 | Slot antenna and cell -phone of cell -phone |
| CN105591190A (en) * | 2015-12-25 | 2016-05-18 | 惠州硕贝德无线科技股份有限公司 | Completely closed metal frame antenna and MIMO antenna thereof |
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