| 摘要 |
An antenna system for an electronic security installation comprising a pair of substantially identical planar multiple loop antennas respectively connected to the transmitter and receiver of the security system and providing an electromagnetic field of high intensity only in the interrogation region of the system while also discriminating against interferring signals originating outside of the interrogation region. Each planar antenna includes two or more loops lying in a common plane with each loop being twisted 180 DEG with respect to each adjacent loop to be in phase opposition. The transmitting antenna and receiving antenna are substantially identical in size and configuration, and each antenna has a total loop area of one phase equal to the total loop area of opposite phase.
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