Magnetic antenna system having independently controllable electr

Details Magnetic antenna system having independently controllable electr Magnetic antenna system having independently controllable electr

1989-09-01

1991-03-12

Wimer, Michael C.

Communications: radio wave antennas

Antennas

High frequency type loops

343842, 343867, H01Q 704

Patent

active

049996410

ABSTRACT:
A magnetic antenna system particularly useable in electronic article surveillance systems for detecting the presence of a resonant tag utilizes multiple loop shielded transmitting and receiving antennas. The antennas employ shield structures that are designed to minimize the electric field response and to provide a balanced magnetic field response. The magnetic field responses of different ones of the loops in each of the antennas are different and the loops are oriented so that more responsive loops of the transmitting antenna are positioned opposite less responsive loops of the receiving antenna and vice versa in order to reduce the coupling between antennas without reducing the sensitivity of the receiving antenna to a tag signal.

REFERENCES:
patent: 4751516 (1988-06-01), Lightblau

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