| 摘要 |
According to one embodiment, an interrogator apparatus includes a transmitting section configured to generate a transmission signal, a receiving section configured to process a reception signal, an antenna configured to transmit and receive a radio signal, a directional coupler configured to supply the transmission signal from the transmitting section to the antenna and supply the reception signal from the antenna to the receiving section, a switching element, a first terminal of which is connected to the directional coupler and a second terminal of which is grounded, the switching element connecting the first terminal or the second terminal to the antenna according to a control signal, and a control section configured to control, when performing carrier sense and detecting a carrier, the switching element to back-scatter an interrupt signal and stop transmission of a radio signal to another interrogator apparatus having a lower priority degree than the interrogator apparatus.
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