| 摘要 |
PROBLEM TO BE SOLVED: To provide a power-door control system in which the passage direction can be controlled. SOLUTION: Antenna sets A, B composed of transmission antennas 2 and receiving antennas 3 are arranged on both sides, holding a power door D, and connected to a reflected wave analyzer 1. The reflected wave analyzer 1 changes over the antenna sets A, B at fixed timing, and transmits scan radio waves. When a man installing an LC resonance tag on a shoe stands on the antenna set A or B, the reflected waves of the LC resonance tag are detected, and the power door D is opened when the LC resonance tag having the resonance frequency is given passage qualification. The door is opened when reflected waves are detected by the antenna set A when the LC resonance tag has passage qualification in the A-B direction and does not have passage qualification in the B-A direction, and the door is not opened when reflected waves are detected by the antenna set B.
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