Method and apparatus for producing uniform electromagnetic field

Details Method and apparatus for producing uniform electromagnetic field Method and apparatus for producing uniform electromagnetic field

1977-05-09

1978-10-03

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

G08B 1324

Patent

active

041186931

ABSTRACT:
An electromagnetic article detection system of the type wherein a target having frequency selective electrical characteristics produces predetermined electromagnetic effects in response to an alternating electromagnetic field. A large resonant electric circuit is placed across an interrogation zone from an interrogation antenna and is inductively coupled to the interrogation antenna to generate secondary electromagnetic waves which cooperate with the primary electromagnetic waves from the interrogation antenna to provide improved distribution of electromagnetic field strength in the interrogation zone.

REFERENCES:
patent: 3500373 (1970-03-01), Minasy
patent: 3707711 (1971-12-01), Cole et al.
patent: 3838409 (1974-09-01), Minasy et al.
patent: 3983552 (1976-09-01), Bakeman, Jr. et al.

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