Asymmetrical antennas for use in electronic security systems

Details Asymmetrical antennas for use in electronic security systems Asymmetrical antennas for use in electronic security systems

1979-11-08

1981-04-07

Lieberman, Eli

Communications: radio wave antennas

Antennas

High frequency type loops

340572, G08B 1324

Patent

active

042609909

ABSTRACT:
An antenna system for use in an electronic security system and having a transmitting antenna with at least one loop lying in a plane, and a receiving antenna having at least two twisted loops lying in a common plane with each loop being twisted 180.degree. and in phase opposition with each adjacent loop. The transmitting and receiving antennas are disposed in spaced substantially parallel relationship across an aisle or passage through which a resonant tag circuit must pass for detection.

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