CN105490025B - Antenna frequency band adjusting device and method thereof - Google Patents
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Abstract
The invention discloses an antenna frequency band adjusting device and a method thereof, wherein the antenna frequency band adjusting device comprises an antenna main body, a parasitic antenna, a CPU (central processing unit) arranged on a PCB (printed circuit board), a radio frequency transceiving module and a selection control module; the CPU controls the connection state of the selection control module according to the current working frequency band, and selects to connect the parasitic antenna or the antenna main body with the radio frequency transceiving module through the selection control module so as to select the parasitic antenna or the antenna main body to transmit and receive signals; therefore, the length of the antenna is automatically changed, the bandwidth of the antenna can be effectively expanded under the condition that the space and the size of the antenna are not changed, the working frequency band of the antenna is changed, and the radiation performance of the antenna is improved.
Description
Technical Field
The invention relates to the technical field of antenna design of electronic products, in particular to an antenna frequency band adjusting device and method.
Background
With the development of communication technology, communication devices such as mobile phones have become indispensable devices. The LTE (Long Term Evolution, commonly referred to as 4G) technology has become a necessary technical requirement for new mobile phones. The LTE has various frequency bands, and in order to add more functions to communication devices such as mobile phones and the like and to meet the trend of thin development, the thinner the mobile phone is, the antenna space can be compressed, and the requirements and difficulty on antenna design are improved.
Fig. 1 shows a block diagram of a conventional antenna design of a communication device such as a mobile phone, in which an rf transceiver module 50010 is connected to an antenna body 30 through a matching circuit 20 of the antenna. The antenna area 40 is generally processed with clearance, a parasitic antenna 50 connected to the ground on the PCB board is further disposed in the antenna area 40, and the parasitic antenna 50 mainly serves to widen the antenna bandwidth and improve the antenna performance. Wherein the large area under the antenna area 40 is the ground. Fig. 1 shows that the conventional antenna has a fixed size, and cannot change its operating frequency band, and cannot effectively extend the bandwidth of the antenna and improve the radiation performance.
In view of the above, the present invention provides an antenna frequency band adjusting apparatus and method thereof.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide an antenna frequency band adjusting apparatus and a method thereof, so as to solve the problem that the existing antenna cannot change the working frequency band and extend the antenna bandwidth.
In order to achieve the purpose, the invention adopts the following technical scheme:
an antenna frequency band adjusting device comprises an antenna main body, a parasitic antenna, a CPU and a radio frequency transceiving module, wherein the CPU and the radio frequency transceiving module are arranged on a PCB, and a selection control module is also arranged on the PCB;
and the CPU controls the connection state of the selection control module according to the current working frequency band, and selects to connect the parasitic antenna or the antenna main body with the radio frequency transceiving module through the selection control module so as to select the parasitic antenna or the antenna main body to transmit and receive signals.
In the antenna frequency band adjusting device, the antenna main body comprises a first feed point and a second feed point; the antenna comprises an antenna body, a first feed point, a second feed point, a parasitic antenna, a radio frequency transceiving module, a first control end, a second control end and a second control end, wherein the first feed point of the antenna body is connected with the first selection end of a selection control module, the second feed point of the antenna body is connected with the second selection end of the selection control module, the parasitic antenna is connected with the third selection end of the selection control module, the radio frequency transceiving module is connected with the transmission end of the selection control module and a CPU, and the CPU is connected with.
In the antenna frequency band adjusting device, the selection control module comprises a first switch, a second switch, a first matching circuit, a second matching circuit, a third matching circuit and a fourth matching circuit;
the antenna comprises a first switch, a second switch, a radio frequency transmitting module, a first matching circuit, a first pin 1, a second pin 2, a second matching circuit, a second feed point, a third pin 3, a parasitic antenna, a fourth pin 2, a fourth matching circuit and a CPU, wherein the first pin 1 of the first switch is connected with the radio frequency transmitting module, the second pin 2 of the first switch is connected with one end of the second matching circuit, the other end of the second matching circuit is connected with the second feed point of the antenna main body, the other end of the second matching circuit is connected with the first feed point of the antenna main body, the fourth pin 4 of the first switch is connected with one end of the third matching circuit, the control pin 3 of the first switch is connected with the CPU, the first pin 1 of the second switch is connected with the parasitic antenna, the second pin 2 of the second switch is connected with the other.
In the antenna frequency band adjusting apparatus, the connection state includes:
the first connection state: the 1 st pin and the 3 rd pin of the first switch are connected, and the 1 st pin and the 3 rd pin of the second switch are connected;
the second connection state: the 1 st pin and the 2 nd pin of the first switch are connected, and the 1 st pin and the 3 rd pin of the second switch are connected;
the third connection state: the 1 st pin and the 4 th pin of the first switch are connected, and the 1 st pin and the 2 nd pin of the second switch are connected.
In the antenna frequency band adjusting device, the antenna covers ultra-low frequency in the first connection state, the antenna covers low frequency and medium frequency in the second connection state, and the antenna covers high frequency in the third connection state.
An antenna frequency band adjustment method, comprising:
A. when the antenna is started, the CPU searches and registers a network, defaults the control module to be in a second connection state, and connects a second feed point of the antenna main body with the radio frequency transceiving module;
B. the CPU controls the connection state of the selection control module according to the current working frequency band, and selects to connect the parasitic antenna or the antenna main body with the radio frequency transceiving module through the selection control module.
In the method for adjusting the frequency band of the antenna, the step B specifically includes:
b1, CPU reads the working frequency band of the radio frequency transceiver module, and judges whether the working frequency band is in the low frequency or the intermediate frequency band: if yes, the current second connection state is maintained, and the step B1 is continuously executed; otherwise, executing step B2;
b2, searching the current available network and judging whether the working frequency band is in the ultra-low frequency range or the high frequency range; if the step B3 is performed in the ultra low frequency range, and if the step B4 is performed in the high frequency range
B3, the CPU controls the selection control module to switch to a first connection state, and connects the first feed point of the antenna main body with the radio frequency transceiver module;
b4, the CPU controls the selection control module to switch to the third connection state, and the parasitic antenna is connected with the radio frequency transceiver module.
Compared with the prior art, the antenna frequency band adjusting device and the method thereof provided by the invention comprise an antenna main body, a parasitic antenna, a CPU (central processing unit) arranged on a PCB (printed circuit board), a radio frequency transceiver module and a selection control module; the CPU controls the connection state of the selection control module according to the current working frequency band, and selects to connect the parasitic antenna or the antenna main body with the radio frequency transceiving module through the selection control module so as to select the parasitic antenna or the antenna main body to transmit and receive signals; therefore, the length of the antenna is automatically changed, the bandwidth of the antenna can be effectively expanded under the condition that the space and the size of the antenna are not changed, the working frequency band of the antenna is changed, and the radiation performance of the antenna is improved.
Drawings
Fig. 1 is a schematic diagram of a conventional antenna structure.
Fig. 2 is a block diagram of an antenna frequency band adjusting apparatus provided in the present invention.
Fig. 3 is a schematic structural diagram of an application embodiment of the antenna frequency band adjustment apparatus provided in the present invention.
Fig. 4 is a schematic diagram of the return loss of the antenna frequency band adjusting device according to the present invention.
Fig. 5 is a flowchart of an antenna frequency band adjustment method according to the present invention.
Fig. 6 is a flowchart of a method for adjusting an antenna frequency band according to an embodiment of the present invention.
Detailed Description
The invention provides an antenna frequency band adjusting device and a method thereof. The antenna bandwidth is increased by increasing the feed point of the antenna and switching the feed point according to the working frequency band, the existing parasitic antenna is reused to be a main antenna, and the antenna works in a wider frequency band range by debugging, so that the antenna with wider bandwidth and better performance can be designed in the existing space. In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 2 and3, the antenna frequency band adjusting apparatus provided by the present invention includes an antenna main body 100, a parasitic antenna 200, a CPU 400 disposed on a PCB, and a radio frequency transceiver module 500. The PCB board is further provided with a selection control module 300. The CPU controls the connection state of the selection control module 300 according to the current working frequency band, and selects to connect the parasitic antenna or the antenna main body with the radio frequency transceiver module through the selection control module, so as to select the parasitic antenna or the antenna main body to transmit and receive signals.
In this embodiment, the antenna main body includes a first feed point 101 and a second feed point 102; the first feed point 101 of the antenna main body 100 is connected to the first selection end a of the selection control module 300, the second feed point 102 of the antenna main body 100 is connected to the second selection end b of the selection control module 300, the parasitic antenna 200 is connected to the third selection end c of the selection control module 300, the rf transceiver module 500 is connected to the transmission end d of the selection control module 300 and the CPU 400, and the CPU 400 is connected to the first control end e and the second control end f of the selection control module 300. The CPU 400 controls the connection state of the selection control module 300 according to the current working frequency band, so as to connect the parasitic antenna 200, the first feed point 101 or the second feed point 102 of the antenna main body 100 with the radio frequency transceiver module 500 through the selection control module 300; therefore, the length of the antenna is automatically changed, the bandwidth of the antenna can be effectively expanded under the condition that the space and the size of the antenna are not changed, the working frequency band of the antenna is changed, and the radiation performance of the antenna is improved.
In this embodiment, the selection control module 300 includes a first switch 301, a second switch 302, a first matching circuit 303, a second matching circuit 304, a third matching circuit 305, and a fourth matching circuit 306. The model of the first switch 301 is RF1628, and the model of the second switch 302 is RF 1117. Each matching circuit is used for fine tuning the resonance of the antenna so as to optimize the performance of the antenna; it is prior art and the specific circuit structure and operation principle thereof will not be described in detail here.
The 1 st pin of the first switch 301 (i.e. the transmission end d of the selection control module 300) is connected to the rf transmitting module, the 2 nd pin of the first switch 301 is connected to one end of the second matching circuit 304, the other end of the second matching circuit 304 (i.e. the second selection end b of the selection control module 300) is connected to the second feed point 102 of the antenna main body 100, the 3 rd pin of the first switch 301 is connected to one end of the first matching circuit 303, the other end of the first matching circuit 303 (i.e. the first selection end a of the selection control module 300) is connected to the first feed point 101 of the antenna main body 100, the 4 th pin of the first switch 301 is connected to one end of the third matching circuit 305, the control pin of the first switch 301 (i.e. the first control end e of the selection control module 300) is connected to the CPU 400, the 1 st pin of the second switch 302 (i.e. the third selection end c of the selection control module 300) is connected to the parasitic antenna 200, the 2 nd pin of the second switch 302 is connected to, the 3 rd pin of the second switch 302 is connected to one end of the fourth matching circuit 306, the other end of the fourth matching circuit 306 is grounded, and the control pin of the second switch 302 (i.e., the second control terminal f of the selection control module 300) is connected to the CPU 400. The radio frequency transceiver module is connected with the first switch, and the matching circuit is connected with the antenna through a radio frequency impedance line.
The present embodiment makes maximum use of the parasitic antenna 200. The parasitic antenna 200 is generally disposed near the antenna body 100, i.e., an antenna near the antenna body 100 is led out from the ground of the PCB board. The CPU 400 controls the switch to perform corresponding switching according to the current working frequency band, that is, the antenna body or the parasitic antenna is connected to the rf transceiver module 500, and resonance is generated by coupling, so that the frequency band of the antenna is adjusted to the required working frequency band, thereby expanding the bandwidth of the antenna. The connection state includes:
first connection state 1-3: 1-3. The previous 1-3 indicates the connection mode of the first switch 301, i.e. the 1 st pin and the 3 rd pin of the first switch 301 are connected. The latter 1-3 indicate the connection mode of the second switch 302, i.e. the 1 st pin and the 3 rd pin of the second switch 302 are connected. In this way, the first feed point 101 of the antenna body 100 is connected to the rf transceiver module 500 through the first matching circuit 303, and the parasitic antenna 200 is grounded through the fourth matching circuit 306. The return loss in this connected state is shown by the dashed line on the left of fig. 4. In fig. 4, the X-axis is frequency and the Y-axis is return loss, and the smaller the return loss value (i.e., near-40, with downward peaks appearing) the better the performance of the antenna. As can be seen from fig. 4, the antenna can cover lower frequency bands, such as band13 and band17 (or other ultra-low frequency bands, such as band12, can be covered by adjusting the matching circuit).
Second connection state 1-2: 1-3. 1-2 represent the connection of the first switch 301, i.e. the 1 st pin and the 2 nd pin of the first switch 301 are connected. 1-3 represent the connection of the second switch 302, i.e., the 1 st pin and the 3 rd pin of the second switch 302 are connected. In this way, the second feed point 102 of the antenna body 100 is connected to the rf transceiver module 500 through the second matching circuit 304, and the parasitic antenna 200 is grounded through the fourth matching circuit 306. The return loss in this connected state is shown by the solid line in fig. 4. As can be seen from FIG. 4, the antenna can cover both low frequencies (e.g., GSM850/GSM 900) and intermediate frequencies (e.g., DCS1800/PCS1900/WCDMA 2100).
Third connection state 1-4: 1-2. The 1 st pin of the first switch 301 is connected to the 4 th pin, and the 1 st pin of the second switch 302 is connected to the 2 nd pin. In this way, the parasitic antenna 200 is connected to the rf transceiver module 500 through the third matching circuit 305, and the antenna body 100 is not connected. The return loss in this connected state is shown by the dashed line on the right in fig. 4. As can be seen from fig. 4, the antenna can cover high frequencies such as band38 and band40 (here, band40 is taken as an example, and for example, the antenna can be slightly adjusted to cover a higher frequency band41 or band 47). In this way, the parasitic antenna 200 is changed to the main antenna, and the original antenna body 100 does not function. The frequency band of the parasitic antenna 200 is adjusted to a required frequency band by adjusting the third matching circuit 305, so that the working bandwidth of the antenna is enlarged.
It should be understood that there may be other combinations of the connection states, and the above three types of connection states can satisfy the requirements of each frequency band, and are not described in detail herein. The antenna frequency band adjusting device is suitable for all communication equipment using an antenna (an antenna adopting an LTE technology), such as a mobile phone, a tablet computer and the like.
Based on the above antenna frequency band adjusting device, the present invention further provides an antenna frequency band adjusting method, as shown in fig. 5, the antenna frequency band adjusting method includes:
s100, searching and registering a network by a CPU (central processing unit) when the computer is started, default selecting a control module to be in a second connection state 1-2: 1-3, connecting the second feed point of the antenna main body with the radio frequency transceiving module.
In this step, the CPU performs full frequency scanning after being turned on, searches for a network that can be connected according to the information of the SIM card, and initiates a connection. Based on this time, the control module is selected to be in the second connection state 1-2: 1-3, namely the second feed point of the antenna main body is connected with the radio frequency transceiving module through a second matching circuit, and the parasitic antenna is grounded through a fourth matching circuit. The antenna can now cover both low frequencies (e.g. GSM850/GSM 900) and intermediate frequencies (e.g. DCS1800/PCS1900/WCDMA 2100), which are commonly used frequency bands.
S200, the CPU controls the connection state of the selection control module according to the current working frequency band, and selects to connect the parasitic antenna or the antenna main body with the radio frequency transceiving module through the selection control module.
Referring to fig. 6, the step S200 specifically includes:
s201, the CPU reads the working frequency band of the radio frequency transceiver module and judges whether the working frequency band is in a low frequency band or a medium frequency band. If so, then the current second connection state 1-2 is maintained: 1-3, continuing to execute the step S201, and continuing to judge whether the working frequency band is in the low-frequency or medium-frequency band; otherwise, step S202 is executed.
S202, searching a current available network and judging whether the working frequency range is in an ultra-low frequency range or a high frequency range: if the step S203 is performed in the ultra low frequency range, the step S204 is performed in the high frequency range.
S203, the CPU controls the selection control module to switch to a first connection state 1-3: 1-3, connecting the first feed point of the antenna main body with the radio frequency transceiving module. Thus, the antenna can cover the ultra-low frequency band after switching. And then, continuously searching the current available network, and judging whether the working frequency band is in a high-frequency range or a low-frequency or medium-frequency band. If the signal is in the high frequency range, the high frequency switching of step S500 is performed. If the frequency range is within the low-frequency or medium-frequency range, the selection control module is switched to a second connection state 1-2: 1-3, then executing step S202 to continue judging.
S204, the CPU controls the selection control module to switch to a third connection state 1-4: 1-2, connecting the parasitic antenna with the radio frequency transceiving module. Thus, the antenna can cover a high-frequency band after switching. And then, continuously searching the current available network and judging whether the working frequency band is in the ultra-low frequency range or the low-frequency or intermediate-frequency band. If the frequency is in the ultra low frequency range, the ultra low frequency switching of step S203 is performed. If the frequency range is within the low-frequency or medium-frequency range, the selection control module is switched to a second connection state 1-2: 1-3, then executing step S202 to continue judging.
Through the steps, the applicable frequency band of the working frequency band can be continuously judged and corresponding switching adjustment can be carried out, so that the coverage of the antenna can be automatically adjusted under different frequency bands, and the communication quality is ensured.
In summary, the antenna frequency band adjusting apparatus and method provided by the present invention add a feed point to the antenna main body, and combine the switching of the two switches to select to access different antennas to the radio frequency transceiver module, so as to change the working frequency band of the antenna, thereby enabling the antenna to cover different frequency bands; meanwhile, the parasitic antenna can also be used as a main antenna, so that the working frequency range of the antenna is greatly enlarged. Therefore, the antenna can work at ultralow frequency, low frequency, intermediate frequency and high frequency without changing the existing space, and the performance of the antenna can be improved.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (5)
1. An antenna frequency band adjusting device comprises an antenna main body, a parasitic antenna, a CPU and a radio frequency transceiving module, wherein the CPU and the radio frequency transceiving module are arranged on a PCB;
the CPU controls the connection state of the selection control module according to the current working frequency band, and selects to connect the parasitic antenna or the antenna main body with the radio frequency transceiving module through the selection control module so as to select the parasitic antenna or the antenna main body to transmit and receive signals;
the antenna body comprises a first feed point and a second feed point; the first feed point of the antenna main body is connected with the first selection end of the selection control module, the second feed point of the antenna main body is connected with the second selection end of the selection control module, the parasitic antenna is connected with the third selection end of the selection control module, the radio frequency transceiver module is connected with the transmission end of the selection control module and the CPU, and the CPU is connected with the first control end and the second control end of the selection control module;
connecting the parasitic antenna, a first feed point or a second feed point of the antenna main body with the radio frequency transceiving module through the selection control module; thereby automatically changing the length of the antenna;
the selection control module comprises a first switch, a second switch, a first matching circuit, a second matching circuit, a third matching circuit and a fourth matching circuit;
a 1 st pin of the first switch is connected with the radio frequency transmitting module, a2 nd pin of the first switch is connected with one end of the second matching circuit, the other end of the second matching circuit is connected with a second feed point of the antenna main body, a 3 rd pin of the first switch is connected with one end of the first matching circuit, the other end of the first matching circuit is connected with a first feed point of the antenna main body, a 4 th pin of the first switch is connected with one end of the third matching circuit, a control pin of the first switch is connected with the CPU, a 1 st pin of the second switch is connected with the parasitic antenna, a2 nd pin of the second switch is connected with the other end of the third matching circuit, a 3 rd pin of the second switch is connected with one end of the fourth matching circuit, the other end of the fourth matching circuit is grounded, and a control pin of the second switch is connected with the CPU;
the radio frequency transceiver module is connected with the first switch, and the matching circuit is connected with the antenna by a radio frequency impedance line;
when the 1 st pin and the 4 th pin of the first switch are connected and the 1 st pin and the 2 nd pin of the second switch are connected, the parasitic antenna becomes a main antenna, and the antenna main body is not connected.
2. The antenna band adjustment apparatus according to claim 1, wherein the connection state includes:
the first connection state: the 1 st pin and the 3 rd pin of the first switch are connected, and the 1 st pin and the 3 rd pin of the second switch are connected;
the second connection state: the 1 st pin and the 2 nd pin of the first switch are connected, and the 1 st pin and the 3 rd pin of the second switch are connected;
the third connection state: the 1 st pin and the 4 th pin of the first switch are connected, and the 1 st pin and the 2 nd pin of the second switch are connected.
3. The antenna band adjustment apparatus according to claim 2, wherein the antenna covers an ultra low frequency in the first connection state, the antenna covers a low frequency and an intermediate frequency in the second connection state, and the antenna covers a high frequency in the third connection state.
4. An antenna frequency band adjusting method is characterized by comprising the following steps:
A. when the antenna is started, the CPU searches and registers a network, defaults the control module to be in a second connection state, and connects a second feed point of the antenna main body with the radio frequency transceiving module;
B. the CPU controls the connection state of the selection control module according to the current working frequency band, and selects to connect the parasitic antenna or the antenna main body with the radio frequency transceiving module through the selection control module;
the antenna body comprises a first feed point and a second feed point; the first feed point of the antenna main body is connected with the first selection end of the selection control module, the second feed point of the antenna main body is connected with the second selection end of the selection control module, the parasitic antenna is connected with the third selection end of the selection control module, the radio frequency transceiver module is connected with the transmission end of the selection control module and the CPU, and the CPU is connected with the first control end and the second control end of the selection control module;
connecting the parasitic antenna, a first feed point or a second feed point of the antenna main body with the radio frequency transceiving module through the selection control module; thereby automatically changing the length of the antenna;
the selection control module comprises a first switch, a second switch, a first matching circuit, a second matching circuit, a third matching circuit and a fourth matching circuit;
a 1 st pin of the first switch is connected with the radio frequency transmitting module, a2 nd pin of the first switch is connected with one end of the second matching circuit, the other end of the second matching circuit is connected with a second feed point of the antenna main body, a 3 rd pin of the first switch is connected with one end of the first matching circuit, the other end of the first matching circuit is connected with a first feed point of the antenna main body, a 4 th pin of the first switch is connected with one end of the third matching circuit, a control pin of the first switch is connected with the CPU, a 1 st pin of the second switch is connected with the parasitic antenna, a2 nd pin of the second switch is connected with the other end of the third matching circuit, a 3 rd pin of the second switch is connected with one end of the fourth matching circuit, the other end of the fourth matching circuit is grounded, and a control pin of the second switch is connected with the CPU;
the radio frequency transceiver module is connected with the first switch, and the matching circuit is connected with the antenna by a radio frequency impedance line;
when the 1 st pin and the 4 th pin of the first switch are connected and the 1 st pin and the 2 nd pin of the second switch are connected, the parasitic antenna is used as a main antenna, and the antenna main body is not connected.
5. The method for adjusting the antenna frequency band according to claim 4, wherein the step B specifically includes:
b1, CPU reads the working frequency band of the radio frequency transceiver module, and judges whether the working frequency band is in the low frequency or the intermediate frequency band: if yes, the current second connection state is maintained, and the step B1 is continuously executed; otherwise, executing step B2;
b2, searching the current available network and judging whether the working frequency band is in the ultra-low frequency range or the high frequency range; if the step B3 is performed in the ultra low frequency range, and if the step B4 is performed in the high frequency range
B3, the CPU controls the selection control module to switch to a first connection state, and connects the first feed point of the antenna main body with the radio frequency transceiver module;
b4, the CPU controls the selection control module to switch to the third connection state, and the parasitic antenna is connected with the radio frequency transceiver module.
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| CN106229677B (en) * | 2016-08-26 | 2019-11-29 | 青岛海信移动通信技术股份有限公司 | A kind of NFC antenna and mobile terminal of mobile terminal |
| CN107240774B (en) * | 2017-04-28 | 2023-10-17 | 歌尔股份有限公司 | Wearable device and control method thereof |
| CN108281770A (en) * | 2018-03-05 | 2018-07-13 | 上海煜鹏通讯电子股份有限公司 | A kind of ultra-wideband antenna and its resonance method |
| CN109120282B (en) * | 2018-08-23 | 2020-12-01 | 珠海格力电器股份有限公司 | Mobile terminal antenna multiplexing system, control method and mobile terminal thereof |
| CN109546293A (en) * | 2018-11-14 | 2019-03-29 | 惠州Tcl移动通信有限公司 | Antenna structure, mobile terminal applied to comprehensive screen mobile terminal |
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| JP2005260762A (en) * | 2004-03-12 | 2005-09-22 | Nec Access Technica Ltd | Antenna switching system and method of communication device |
| CN103928752A (en) * | 2014-04-11 | 2014-07-16 | 广东欧珀移动通信有限公司 | Mobile phone and antenna thereof |
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| JP2005260762A (en) * | 2004-03-12 | 2005-09-22 | Nec Access Technica Ltd | Antenna switching system and method of communication device |
| CN103928752A (en) * | 2014-04-11 | 2014-07-16 | 广东欧珀移动通信有限公司 | Mobile phone and antenna thereof |
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