Field strength uniformity control system

Details Field strength uniformity control system Field strength uniformity control system

1975-05-07

1978-04-11

Swann, III, Glen R.

Communications: electrical

Systems

Call station

323125, 325180, 340258C, G08B 1324

Patent

active

RE0296104

ABSTRACT:
An electromagnetic interrogation field in a theft detection system is made effectively more uniform by energizing different antenna windings lying in different planes at the same frequency but at different phases so that the resulting field pattern rotates in the vicinity of the antenna windings.

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patent: 1853021 (1932-04-01), Alexanderson
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patent: 3665449 (1972-05-01), Elder et al.
patent: 3676772 (1972-07-01), Lee
patent: 3740742 (1973-06-01), Thompson et al.
patent: 3755803 (1973-08-01), Cole et al.
patent: 3820104 (1974-06-01), Fearon
patent: 3891980 (1975-06-01), Lewis et al.
patent: 3938125 (1976-02-01), Benassi

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