| 摘要 |
<P>PROBLEM TO BE SOLVED: To transmit stable power in a microwave power transmission system. <P>SOLUTION: A tag reader 12 transmits a reference power signal not having directivity and having prescribed power inside a prescribed range before receiving a pilot signal from an RFID tag 11. The RFID tag 11 measures the power of the reference power signal by a power meter 28, and transmits the pilot signal superimposed with data of a measurement result thereof to the tag reader 12. A CPU 48 of the tag reader 12 adjusts the power such that the power has a value necessary for the RFID tag 11 such that a microwave is focused to a direction of the RFID tag 11 based on the data of the measurement result of the power as a result wherein an arrival direction of the pilot signal is detected by an angle detection circuit 55. <P>COPYRIGHT: (C)2008,JPO&INPIT |
