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

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.