| 摘要 |
<p>PROBLEM TO BE SOLVED: To simply detect a plurality of objects, by simply constructing an apparatus. SOLUTION: Three antennas 32, 34, 36 are connected, in an array shape, to one high-frequency cable 10 via branch parts 12, 14, 16 and via guy cables 22, 24, 26. A high-frequency pulsed signal is output from a controller 40 which is connected to one end of the high-frequency cable 10. The branch parts 12, 14, 16 are constituted of directional couplers. Traveling waves 20F are distributed to the guy cables 22, 24, 26 in a preset distribution ratio. Reflected waves 20B as their reflection are coupled by the directional couplers so as to be fed back. That is to say, whether an object Obj to be detected exists or not is detected by the controller 40 on the basis of the time difference of the reflected waves 20B.</p> |
