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Circuit and method for reducing antenna SAR

An antenna and circuit technology, which is applied in the field of circuits for reducing antenna SAR, can solve the problems of high wiring requirements and low suppression precision, and achieve the effects of low wiring adjustment requirements, suppressing power radiation, and reducing power

Active Publication Date: 2020-09-18
HUAQIN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a circuit and method for reducing antenna SAR in order to overcome the shortcomings of high wiring requirements and low suppression accuracy in the implementation of reducing antenna SAR in the prior art

Method used

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  • Circuit and method for reducing antenna SAR
  • Circuit and method for reducing antenna SAR
  • Circuit and method for reducing antenna SAR

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment provides a circuit for reducing antenna SAR, refer to figure 1 , the circuit for reducing antenna SAR in this embodiment includes an impedance tuning circuit 1, a first antenna tuning switch 2 and a resistor 3;

[0047] An antenna terminal T1 of the first antenna tuning switch 2 is electrically connected to an external antenna signal source 4;

[0048] The control terminal K1 of the first antenna tuning switch 2 is electrically connected to the external controller 5;

[0049] The first radio frequency output terminal R1 of the first antenna tuning switch 2 is electrically connected to one end of the resistor 3, and the other end of the resistor 3 is electrically connected to the second radio frequency output terminal R2 of the first antenna tuning switch 2 and one terminal A1 of the impedance tuning circuit 1 ;

[0050] The other end A2 of the impedance tuning circuit 1 is electrically connected to the antenna 6;

[0051] The external controller 5 is ...

Embodiment 2

[0054] This embodiment further improves the circuit for reducing antenna SAR in embodiment 1, and provides a circuit for reducing antenna SAR. refer to figure 2 , the circuit for reducing antenna SAR of this embodiment further includes a second antenna tuning switch 7 and at least one radio frequency filter circuit 8 on the basis of embodiment 1;

[0055] The radio frequency filter circuit 8 is used to filter the preset frequency point signal;

[0056] The antenna terminal T2 of the second antenna tuning switch 7 is electrically connected to the antenna 6, and the control terminal K2 of the second antenna tuning switch 7 is electrically connected to the external controller 5;

[0057] The radio frequency filter circuit 8 is electrically connected to any radio frequency output terminal of the second antenna tuning switch 7, and is electrically connected to the radio frequency output terminal R3 of the second antenna tuning switch 7 in this embodiment;

[0058] The external c...

Embodiment 3

[0078] This embodiment implements a method for reducing antenna SAR, which is used in a mobile terminal, and the mobile terminal includes a controller and a circuit for reducing antenna SAR in Embodiment 2. Refer to Figure 4 , the method for reducing the antenna SAR of the present embodiment includes the following steps:

[0079] S100. Obtain the SAR test result of the antenna;

[0080] S200, judging whether the SAR test result exceeds the standard;

[0081] If yes, perform step S300; if not, perform step S400;

[0082] S300. The controller controls the antenna terminal of the first antenna tuning switch to conduct with the first radio frequency output terminal, controls the second antenna tuning switch to conduct the radio frequency filter circuit, and the process ends;

[0083] S400. The controller controls the antenna terminal of the first antenna tuning switch to conduct with the second radio frequency output terminal, and the process ends.

[0084] The method for redu...

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PUM

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Abstract

The invention discloses a circuit and method for reducing antenna SAR. The circuit comprises an impedance tuning circuit, a first antenna tuning switch and a resistor. The antenna end of the first antenna tuning switch is electrically connected with an external antenna signal source; the control end of the first antenna tuning switch is electrically connected with an external controller; a first radio frequency output end of the first antenna tuning switch is electrically connected with one end of the resistor, and the other end of the resistor and a second radio frequency output end of the first antenna tuning switch are electrically connected with one end of the impedance tuning circuit; the other end of the impedance tuning circuit is electrically connected with an antenna; the externalcontroller is used for controlling the antenna end to be conducted with the first radio frequency output end when an SAR test result of the antenna exceeds the standard; and when the SAR test resultof the antenna does not exceed the standard, the antenna end is controlled to be conducted with the second radio frequency output end. According to the invention, the first antenna tuning switch and the resistor are added to an impedance adjusting circuit for voltage division, so that the power of a frequency point can be reduced, the power radiation is inhibited, and the antenna SAR is reduced.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a circuit and method for reducing the SAR of an antenna. Background technique [0002] There will be a certain amount of electromagnetic radiation during the working process of the antenna. The SAR (Specific Absorption Rate) index is used internationally to measure the energy absorbed by the human body in an electromagnetic exposure environment. Frequently asked questions in antenna testing. In the prior art, there are mainly two methods to reduce the antenna SAR. Method 1 is to change the maximum gain point of the antenna, disperse the maximum hot spot of the antenna radiation or change the directionality of the antenna radiation hot spot; Therefore, method one is not easy to implement, and it is difficult to develop. The second method is to reduce the conduction power of the antenna. Since the requirements of 3GPP (3rd Generation Partnership Project, 3rd Generation Partnersh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q23/00G01R29/10
CPCH01Q23/00G01R29/10H04B1/18
Inventor 张杰罗晓武
Owner HUAQIN TECH CO LTD