Method and apparatus for producing uniform electromagnetic...

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

G - Physics

08

B

340/124.3

G08B 13/24 (2006.01)

Patent

CA 1115805

ABSTRACT OF DISCLOSURE An electromagnetic article detection system of the type wherein a target having frequency selective electrical charac- teristics 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 electro- magnetic field strength in the interrogation zone.

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