Ring antennas for resonant circuits

Details Ring antennas for resonant circuits Ring antennas for resonant circuits

1996-12-19

1999-01-26

Wong, Don

Communications: radio wave antennas

Antennas

Including magnetic material

343741, 343841, H01Q 100, H01Q 708

Patent

active

058643230

ABSTRACT:
A ring antenna (10) for resonant circuits for identifying metallic containers has an annular core (11) having at least one core surface (11a') corresponding to at least one surface of the container and made from ferrite. The core may be U-shaped, having a base portion and a first and second arm portions, or L-shaped, having a base portion and a first arm portion (11a). The antenna (10) also has a copper wire coil (12) wound around a first portion of the core; and an aluminum shield (13) affixed to the at least one core surface (11b') and separating the core from the surface of the container. Further, a interrogation system for identifying metallic containers includes the ring antenna (10) coupled to a resonant circuit (86) included in a transponder or a reader.

REFERENCES:
patent: 2740113 (1956-01-01), Hemphill
patent: 4839659 (1989-06-01), Stern et al.
patent: 5561438 (1996-10-01), Nakazawa et al.
patent: 5625366 (1997-04-01), D'Hont
patent: 5625370 (1997-04-01), D'Hont
patent: 5671621 (1997-09-01), Watanuki et al.
patent: 5694139 (1997-12-01), Saito et al.

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