Patent ID: 7146139

Claim:
A system for controlling the average power and duration of radio frequency electromagnetic energy radiated by a mobile communication device, comprising: an antenna having an impedance that is alterable for changing the amount of radio frequency electromagnetic energy provided to the antenna via an antenna feed and reflected onto the antenna feed when the antenna is in proximity to a body, the antenna being detuned when not in proximity to the body and becoming tuned when in proximity to the body; a sensor coupled to the antenna for sensing radio frequency electromagnetic energy reflected by the antenna for determining the proximity of the antenna to the body, the sensor determining proximity of the mobile communication device to the body by measuring radio frequency electromagnetic energy reflected by the antenna in the vicinity of the body; and a controller for controlling radiation of radio frequency electromagnetic energy by the mobile communication device, wherein the controller is capable of reducing at least one of the average power and the duration of the radio frequency electromagnetic energy radiated by the mobile communication device when the sensor assembly senses that the mobile communication device is in proximity to the body.