Shielded, closely spaced transmit-receiver antennas for electron

Details Shielded, closely spaced transmit-receiver antennas for electron Shielded, closely spaced transmit-receiver antennas for electron

1983-07-05

1985-04-02

Gill, James J.

Communications: electrical

Condition responsive indicating system

Specific condition

343842, G08B 1324, H01Q 704

Patent

active

045090394

ABSTRACT:
A shielded, closely spaced transmit-receiver system for use in an electronic article surveillance system is disclosed wherein at least one of the antennas is provided with at least two twisted loops lying in a common plane each loop being twisted 180.degree. to be in phase opposition with the adjacent loop and wherein both antennas are substantially enclosed by a conductive shield having a discontinuity in an outer portion enclosing each of the twisted loops.

REFERENCES:
patent: 3740742 (1973-06-01), Thompson et al.
patent: 3810147 (1974-05-01), Lichtblau
patent: 3810172 (1974-05-01), Burpee et al.
patent: 4023167 (1977-05-01), Wahlstrom
patent: 4251808 (1981-02-01), Lichtblau
patent: 4373163 (1983-02-01), Vandebult
patent: 4394645 (1983-07-01), Humble et al.

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