Patent ID: 7515925

Claim:
A wireless communication device comprising: an antenna configured to carry out a wireless communication with a communication object; a carrier wave transmitting unit configured to transmit via the antenna a carrier wave to the communication object located in a communication ready area from the antenna as a base point, the carrier wave having a level exceeding a threshold level that can render the communication object to generate electric power for the communication; a carrier wave control unit configured to periodically set the level of the carrier wave transmitted from the carrier wave transmitting unit temporarily lower than the threshold level; and a signal receiving unit configured to receive via the antenna a response signal transmitted in reply to the carrier wave from the communication object in the communication ready area, wherein the carrier wave control unit temporarily sets the carrier wave to a level lower than the threshold level when the signal receiving unit does not receive the response signal within a certain period of time after the carrier wave transmitting unit transmits the carrier wave.