| 摘要 |
PURPOSE:To enable a voltage standing wave ratio to be detected accurately without being affected by an interference wave by providing a coupling means for detecting an incidence wave and a reflection wave of a multiple wave, a band-pass filtering means, a detection means, and an operation means. CONSTITUTION:An antenna monitoring device 101 allows a band-pass filter 21 to be carried in between a directivity coupler 12 and a detection circuit 14 for detecting an incidence wave for enabling, for example, an incidence wave of a carrier f1 of a transmitter Tx1 to be band-filtered from carriers f1,', fn which are output from a plurality of transmitters Tx1,..., Txi,..., TXn, respectively. Also, a band-pass filter 22 for performing band-filtering of a reflection wave of the carrier f1 of the transmitter Tx1 is inserted between the coupler 12 and a detection circuit 15 for detecting the reflection wave, thus enabling only the incidence wave and the reflection wave to an antenna 13 of the carrier f1 of the transmitter Tx1 to be detected owing to band-filtering operation of the filters 21 and 22, influence of beat between the carrier f1 and other carriers f2, f3,... to be eliminated, and a detection accuracy of the incidence wave and the reflection wave to be increased. |
