| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily detect a plurality of objects to be detected, by constituting an apparatus simple. SOLUTION: Three antennas 32, 34, 36 are connected in an array shape to one trunk cable 10 via branch parts 12, 14, 16 whose distribution ratio can be set and via stay cables 22, 24, 26. A high-frequency pulse signal is output from a controller 40 which is connected to one end of the trunk cable 10. The branch parts 12, 14, 16 are constituted of directional couplers. Traveling waves 20F are distributed to the stay cables 22, 24, 26 in a preset distribution ratio. Nearly identical power is supplied to the antennas 32, 34, 36 irrespective of a cable length. Reflected waves 20B as their reflection are couled by the directional couplers so as to be fed back. In the controller 40, the existence of an object Obj to be detected is detected by the time difference of the reflected waves 20B.</p> |
