| 摘要 |
PROBLEM TO BE SOLVED: To solve problems of a conventional wireless transmitter-receiver that part of a transmission signal is sneaked into a reception section in the case of transmitting the transmission signal in the conventional radio transmitter-receiver in an RFID system and that the conventional radio transmitter-receiver employing switching only cannot be used for the RFID system because the RFID system carries out signal processing by a change in a received level. SOLUTION: In the radio transmitter-receiver disclosed herein comprising: a reception antenna 1 for receiving a radio wave; a demodulation section 2 for demodulating the radio wave received by the reception antenna; a switching section 3 including a capacitor and a switching element provided in a path for transmitting a demodulation signal demodulated by the demodulation section; and a signal generating section 5 for generating a clock signal for transmitting a radio wave, the switching section 3 carries out switching nearly synchronously with a signal generating section 5 and is deactivated when the switching section is turned off. The capacitor stores a just preceding signal level to prevent a sneak path of the transmission signal. COPYRIGHT: (C)2007,JPO&INPIT
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