Terminal antenna control method and apparatus

1 . A terminal antenna control method, comprising:

obtaining a real-time reflection coefficient of an antenna of a terminal device;

determining, based on the real-time reflection coefficient, whether the antenna is in a human body use scenario;

if the antenna is in the human body use scenario, determining whether a specific absorption rate (SAR) of the antenna is greater than or equal to a first preset threshold; and

if the SAR is greater than or equal to the first preset threshold, adjusting an adjustable device of the antenna to increase a reflection coefficient of a transmit frequency band of the antenna, wherein the adjustable device comprises a capacitor and/or an inductor.

2 . The method according to claim 1 , wherein the determining, based on the real-time reflection coefficient, whether the antenna is in a human body use scenario comprises:

calculating a distance difference between locations that are of the real-time reflection coefficient and a free space FS reflection coefficient of the antenna and that are on a Smith chart; and

determining, based on the distance difference, whether the antenna is in the human body use scenario.

3 . The method according to claim 2 , wherein the calculating a distance difference between locations that are of the real-time reflection coefficient and a free space FS reflection coefficient of the antenna and that are on a Smith chart comprises:

determining a first coordinate point of the real-time reflection coefficient on the Smith chart;

determining a second coordinate point of the FS reflection coefficient of the antenna on the Smith chart; and

calculating a distance between the first coordinate point and the second coordinate point, and determining the distance as the distance difference.

4 . The method according to claim 2 , wherein the determining, based on the distance difference, whether the antenna is in the human body use scenario comprises:

when the distance difference is greater than or equal to a second preset threshold, determining that the antenna is in the human body use scenario.

5 . The method according to claim 1 , wherein the method further comprises:

if the antenna is not in the human body use scenario, determining that the antenna is in an FS state, and maintaining a current state of the antenna.

6 . The method according to claim 1 , wherein the method further comprises:

if the SAR is less than the first preset threshold, maintaining a current state of the antenna.

7 . A terminal antenna control apparatus, comprising:

an obtaining module, configured to obtain a real-time reflection coefficient of an antenna of a terminal device; and

a processing module, configured to: determine, based on the real-time reflection coefficient, whether the antenna is in a human body use scenario; if the antenna is in the human body use scenario, determine whether a specific absorption rate (SAR) of the antenna is greater than or equal to a first preset threshold; and if the SAR is greater than or equal to the first preset threshold, adjust an adjustable device of the antenna to increase a reflection coefficient of a transmit frequency band of the antenna, wherein the adjustable device comprises a capacitor and/or an inductor.

8 . The apparatus according to claim 7 , wherein the processing module is specifically configured to:

calculate a distance difference between locations that are of the real-time reflection coefficient and a free space FS reflection coefficient of the antenna and that are on a Smith chart; and

determine, based on the distance difference, whether the antenna is in the human body use scenario.

9 . The apparatus according to claim 8 , wherein the processing module is specifically configured to:

determine a first coordinate point of the real-time reflection coefficient on the Smith chart;

determine a second coordinate point of the FS reflection coefficient of the antenna on the Smith chart; and

calculate a distance between the first coordinate point and the second coordinate point, and determine the distance as the distance difference.

10 . The apparatus according to claim 8 , wherein the processing module is specifically configured to:

when the distance difference is greater than or equal to a second preset threshold, determine that the antenna is in the human body use scenario.

11 . The apparatus according to claim 7 , wherein the processing module is further configured to:

if the antenna is not in the human body use scenario, determine that the antenna is in an FS state, and maintain a current state of the antenna.

12 . The apparatus according to claim 7 , wherein the processing module is further configured to:

if the SAR is less than the first preset threshold, maintain a current state of the antenna.

13 . A terminal antenna control method, comprising:

obtaining a real-time reflection coefficient of an antenna of a terminal device;

determining, based on the real-time reflection coefficient, whether the antenna is in a human body use scenario;

if the antenna is in the human body use scenario, determining whether a specific absorption rate (SAR) of the antenna is greater than or equal to a first preset threshold; and

if the SAR is less than the first preset threshold, maintaining a current state of the antenna; or

if the SAR is greater than or equal to the first preset threshold, adjusting an adjustable device of the antenna to increase a reflection coefficient of a transmit frequency band of the antenna, wherein the adjustable device comprises a capacitor and/or an inductor.

14 . The method according to claim 13 , wherein the determining, based on the real-time reflection coefficient, whether the antenna is in a human body use scenario comprises:

calculating a distance difference between locations that are of the real-time reflection coefficient and a free space FS reflection coefficient of the antenna and that are on a Smith chart; and

determining, based on the distance difference, whether the antenna is in the human body use scenario.

15 . The method according to claim 14 , wherein the calculating a distance difference between locations that are of the real-time reflection coefficient and a free space FS reflection coefficient of the antenna and that are on a Smith chart comprises:

determining a first coordinate point of the real-time reflection coefficient on the Smith chart;

determining a second coordinate point of the FS reflection coefficient of the antenna on the Smith chart; and

calculating a distance between the first coordinate point and the second coordinate point, and determining the distance as the distance difference.

16 . The method according to claim 15 , wherein the determining, based on the distance difference, whether the antenna is in the human body use scenario comprises:

when the distance difference is greater than or equal to a second preset threshold, determining that the antenna is in the human body use scenario.

17 . The method according to claim 15 , wherein the method further comprises:

if the antenna is not in the human body use scenario, determining that the antenna is in an FS state, and maintaining a current state of the antenna.

18 . The method according to claim 14 , wherein the determining, based on the distance difference, whether the antenna is in the human body use scenario comprises:

when the distance difference is greater than or equal to a second preset threshold, determining that the antenna is in the human body use scenario.

19 . The method according to claim 14 , wherein the method further comprises:

if the antenna is not in the human body use scenario, determining that the antenna is in an FS state, and maintaining a current state of the antenna.

20 . The method according to claim 13 , wherein the method further comprises:

if the antenna is not in the human body use scenario, determining that the antenna is in an FS state, and maintaining a current state of the antenna.