Communications: directive radio wave systems and devices (e.g. – Radar transponder system
Patent
1991-03-08
1993-03-09
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Radar transponder system
343719, 342368, G01S 1374
Patent
active
051929546
ABSTRACT:
Antennas designed for use in producing effective electromagnetic capture zones for transponders mounted on moving vehicles. The antenna systems disclosed are principally designed to be mounted at or near the surface of a roadway carrying the vehicle whose transponder is to be interrogated. A principal advantage of the antennas of the invention is minimal interference with normal operation of the road and greatly reduced cost of installation when used in providing vehicle identification, toll collection, or communication with the transponder carrying vehicle.
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Brockelsby William K.
Gillis Donald P.
Hryciuk Michael H.
Walker Conrad M. B.
Hellner Mark
Lidd Francis J.
Mark IV Transportation Products Corporation
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