Unidirectional field antenna for identification system

Details Unidirectional field antenna for identification system Unidirectional field antenna for identification system

1997-02-21

1999-08-17

Tokar, Michael

Communications: radio wave antennas

Antennas

High frequency type loops

343895, 343867, 343842, H01Q 1112

Patent

active

059400439

ABSTRACT:
An antenna system for use in detecting an information tag in an interrogation zone comprising a first coil for generating a first field in an interrogation zone, a second coil that is larger than said first coil and positioned proximate the first coil for generating a second field that opposes the first field, and a nonferrous conductive plate positioned proximate the first and second coils and being shaped so that its periphery is approximately at least as large as the periphery of the second coil.

REFERENCES:
patent: 3151328 (1964-09-01), Boyer
patent: 3534372 (1970-10-01), Scheuerecker et al.
patent: 4564835 (1986-01-01), Dhawan
patent: 5053774 (1991-10-01), Schuermann et al.
patent: 5321412 (1994-06-01), Kopp et al.
patent: 5552649 (1996-09-01), Cowan, Jr. et al.

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