| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a passage loss of power and to measure a precise standing wave ratio. <P>SOLUTION: A standing wave ratio measuring circuit 1 includes an amplifier circuit 110 of a transmission system, a first circulator 120 outputting an amplified transmission signal in a direction of an antenna 190, and outputting a reception signal received by the antenna 190 to a reception system, a traveling-wave bypass unit 140 for allowing the transmission signal (traveling wave) before being inputted to the amplifier circuit 110 to the reception system by bypassing the amplifier circuit 110 when a measurement request of the standing wave ratio is detected, a second circulator 150 outputting the bypassed traveling wave in a direction of the first circulator 120, a control unit 160 for controlling the amplifier circuit 110 so that the outputted traveling wave travels in the direction of the antenna 190 via the first circulator 120, a reflected wave acquisition unit 170 for acquiring a reflected wave after the second circulator 150 in the reception system, and a measurement circuit 180 for measuring the standing wave ratio by the traveling wave and the reflected wave. <P>COPYRIGHT: (C)2011,JPO&INPIT |
