Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1976-06-21
1978-08-01
Hubler, Malcolm F.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 65SS, 343 68R, G01S 956
Patent
active
041046307
ABSTRACT:
A vehicle identification system, using microwave, in which every vehicle to be identified has an identification panel attached to its side, containing a very low level power drain tunnel diode transponder and a digital coder plus a small battery and a resonant frequency array. Interrogating transmitter-receivers are placed at designated ground stations. For verification purposes there is a resonant reflective array printed on the identification panel to reflect back a doppler offset signal emitted by the interrogating transmitter, thereby registering that a vehicle with an identification panel has passed, even if the transponder has failed. Unlike optical scanners used for freight car identifications, this system cannot be disrupted by dirt, ice and snow. Vehicles do not have to slow down to be interrogated, and the emitted field strength from this plate is so low that F.C.C. licensing is not required. The code stored in the panel is readily programmable, if desired.
REFERENCES:
patent: 3296615 (1967-01-01), Page et al.
patent: 3312970 (1967-04-01), Bond
patent: 3691557 (1972-09-01), Constant
patent: 3745569 (1973-07-01), Works et al.
patent: 3918057 (1975-11-01), Van Tol
patent: 4001822 (1977-01-01), Sterzer
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