Patent ID: 9362891
Filing Date: 2016-06-07
CPC Classification: H03J,H04B

Claim Text:
1. A communication device, comprising: an antenna comprising an antenna feed point having an associated load impedance of the antenna; a tunable circuit coupled to the antenna feed point and having a variable reactive impedance adjustable to compensate for a change in the load impedance of the antenna; a tuning sensor in communication with the tunable circuit and providing a sensor signal based on a mode of operation of the communication device; a memory that stores executable instructions; and a processor coupled to the memory, the tuning sensor, the tunable circuit, and the antenna, wherein the processor, responsive to executing the instructions, performs operations comprising: presenting a first prompt at a user interface of the communication device to calibrate the communication device; and detecting user input at the user interface responsive to the first prompt; initiating a mode of operation of the communication device responsive to the detecting of the user input; measuring the sensor signal to determine an adverse state comprising the change in the load impedance of the antenna caused by the mode of operation of the communication device; determining a tuning state based on the sensor signal; tuning the tunable circuit according to the tuning state to compensate for the adverse state; storing the tuning state in a look-up table indexed according to the mode of operation of the communication device; detecting a reinitiating of the mode of operation of the communication device; retrieving, in response to the detecting of the reinitiating of the mode and without performing a sensor signal measurement, the tuning state from the look-up table based on the mode of operation of the communication device; and tuning the tunable circuit according to the tuning state retrieved from the look-up table.