| 摘要 |
PROBLEM TO BE SOLVED: To prevent a signal transmitted by radio from an interrogator from unwillingly interfering radio communication of anther interrogator in an interrogator system provided with plural interrogators performing radio communication with a mobile information communication body with respective antennas while overlapping their communicable areas each other. SOLUTION: For instance, in the communicable area of one interrogator R2, the other interrogator R1 is arranged, and the interrogator R1 is provided with a detecting means 4 which detects a signal transmitted by radio from the interrogator R2 by using an antenna 1 in the two interrogators (reader- writers) R1 and R2. Then, a controller 5 constituting a communicating means controls a radio wave power supply transmitter 2 and transmits a query signal to mobile information communication bodies (IC card) Q1 and Q2 by radio from the antenna 1 in accordance with the detection of a no signal state by the means 4.
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