Wireless terminal with reduced SAR peak value and method for reducing SAR peak value by using the wireless terminal

Patent metadata

Field	Value
Publication number	US-9331730-B2
Application number	US-201214350134-A
Country	US
Kind code	B2
Filing date	Feb 21, 2012
Priority date	Oct 12, 2011
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

A wireless terminal with a reduced Specific Absorption Rate (SAR) peak value and a method for reducing an SAR peak value by using the wireless terminal are disclosed. The wireless terminal with a reduced SAR peak value includes a first antenna configured to receive or transmit a communication signal, and further includes: a second antenna configured to feed a coupling signal when the first antenna receives or transmits the communication signal, and a signal processing module configured to process the coupling signal to reduce an SAR peak value of the communication signal for a human body. The energy of a superposed signal in a human body orientation is reduced by superposing the coupling signal with the communication signal, so as to reduce the SAR peak value effectively.

First claim

The invention claimed is:

1. A wireless terminal with a reduced Specific Absorption Rate (SAR) peak value, which comprises a first antenna configured to receive or transmit a communication signal, wherein the wireless terminal further comprises:
a second antenna, configured to feed a coupling signal when the first antenna receives or transmits the communication signal; and
a signal processing module, configured to process the coupling signal to reduce an SAR peak value of the communication signal for a human body; and
a human body sensor, configured to sense and output orientation information of the human body;
wherein the signal processing module is further configured to:
receive the orientation information of the human body,
determine, according to the orientation information of the human body and an amplitude and a phase of the communication signal, the amplitude and the phase of the coupling signal corresponding to a minimum value of the energy of the near-field superposed signal in the human body orientation, and
adjust the coupling signal according to the determined amplitude and phase of the coupling signal.

2. The wireless terminal with a reduced SAR peak value according to claim 1 , wherein the signal processing module is further configured to:
adjust an amplitude and a phase of the coupling signal, so as to change an amplitude ratio and a phase difference between the coupling signal and the communication signal and to reduce energy of a near-field superposed signal of the coupling signal and the communication signal.

3. The wireless terminal with a reduced SAR peak value according to claim 2 , wherein the second antenna comprises:
a second feed source, configured to feed the coupling signal; and
a second radiator, configured to receive or transmit the coupling signal.

4. The wireless terminal with a reduced SAR peak value according to claim 3 , wherein the second radiator is a tortuous conducting line or a conducting strip with multiple branches.

5. The wireless terminal with a reduced SAR peak value according to claim 4 , wherein the human body sensor is an optical sensor, a thermal sensor, a gravity sensor or a proximity sensor, and the human body sensor includes multiple human body sensors distributed on each inner surface of the wireless terminal.

6. The wireless terminal with a reduced SAR peak value according to claim 1 , wherein the second antenna is further configured to feed the communication signal, and receive or transmit the communication signal.

7. A method for reducing a Specific Absorption Rate (SAR) peak value by using a wireless terminal, comprising:
feeding a coupling signal when a communication signal is received or transmitted; and
processing the coupling signal to reduce an SAR peak value of the communication signal for a human body;
wherein the step of processing the coupling signal to reduce an SAR peak value of the communication signal for a human body comprises:
adjusting an amplitude and a phase of the coupling signal, so as to change an amplitude ratio and a phase difference between the coupling signal and the communication signal and to reduce energy of a near-field superposed signal of the coupling signal and the communication signal; and
the method further comprises: before the amplitude and the phase of the coupling signal are adjusted,
sensing orientation information of the human body; and
determining, according to the orientation information of the human body and an amplitude and a phase of the communication signal, the amplitude and the phase of the coupling signal corresponding to a minimum value of the energy of the near-field superposed signal in the human body orientation.

Assignees

• Zhang Lu
• Li Long
• Yang Yang
• Zte Corp

Inventors

• Zhang Lu
• Li Long
• Yang Yang

Classifications

• H01Q1/52

  Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure (absorbing means H01Q17/00) · CPC title

• H01Q21/28

  Combinations of substantially independent non-interacting antenna units or systems {(multiple beam H01Q25/00)} · CPC title

• H01Q1/2275

  associated to expansion card or bus, e.g. in PCMCIA, PC cards, Wireless USB · CPC title

• H01Q9/42

  with folded element, the folded parts being spaced apart a small fraction of the operating wavelength · CPC title

• H04B1/3838 Primary

  Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use · CPC title