Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1976-06-28
1978-10-31
Buczinski, S. C.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
331 2, 331 55, 343 5SA, G01S 956
Patent
active
041237544
ABSTRACT:
An electronic detection and identification system for use in the rapid identification of vehicles at a toll stop, and like uses, is provided which employs an electronic identification card that is carried by the vehicle to be identified and a fixed transmitter-receiver unit that transmits a signal to the card and receives a reflected signal therefrom. The card contains passive resonant circuitry for producing an output signal having a frequency which is a selected harmonic of the signal transmitted thereto. In operation, the card is radiated with a signal which has a freqency in the Gigahertz range and which is produced by frequency sweeping and multiplying a frequency stable RF signal. The signal reflected by the card is narrow band-filtered and RF amplitude (envelope) detected. The detection envelope, which is the "signature" of the received signals, is compared with a reference profile to determine whether a match exists. An appropriate action, such as the generation of a "go" signal, is initiated based on the results of the comparison.
REFERENCES:
patent: 2986631 (1961-05-01), Jose et al.
patent: 3283260 (1966-11-01), Vaughan
patent: 3379992 (1968-04-01), Hoo
patent: 3798642 (1974-03-01), Augenblick et al.
patent: 3878528 (1975-04-01), Majeau
patent: 3914762 (1975-10-01), Klensch
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