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Wireless communication device for periodically controlling a carrier wave to establish a good communication state with a communication object

  • US 7,515,925 B2
  • Filed: 12/29/2004
  • Issued: 04/07/2009
  • Est. Priority Date: 02/03/2004
  • Status: Active Grant
First Claim
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1. 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.

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