Composite antenna for electronic article surveillance systems

Details Composite antenna for electronic article surveillance systems Composite antenna for electronic article surveillance systems

1990-02-01

1991-10-29

Wimer, Michael C.

Communications: radio wave antennas

Antennas

High frequency type loops

343856, 340572, H01Q 1112

Patent

active

050619411

ABSTRACT:
A composite antenna system for an article surveillance system, in which a plurality of differently-phased loop antennas are supplied with different currents to provide desired positioning of peaks and nulls in the near-field strength, and to produce near-zero far-field strength, as desired. In one preferred form, a smaller loop is placed near the floor and a larger loop placed above it, with the lower loop supplied with a correspondingly higher-intensity of current to provide an enhanced near-field strength near the floor, while still maintaining far-field cancellation.

REFERENCES:
patent: 4243980 (1981-01-01), Lichtblau
patent: 4260990 (1981-04-01), Lichtblau
patent: 4751516 (1988-06-01), Lichtbau
patent: 4866455 (1989-09-01), Lichtbau
patent: 4872018 (1989-10-01), Feltz et al.

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