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Roadway antennae

DC
  • US 5,192,954 A
  • Filed: 03/08/1991
  • Issued: 03/09/1993
  • Est. Priority Date: 02/13/1981
  • Status: Expired due to Term
First Claim
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1. An antenna array embedded in the surface of a bi-directional multi-lane roadway having predetermined land widths for establishing radio frequency communication between a roadside interrogator and a transponder mounted on the underside of a vehicle moving along one of said roadway lanes comprising:

  • a plurality of radiating elements each having an associated electromagnetic field, said elements generally disposed in said roadway pavement and configured to generate an electromagnetic field alternating at a predetermined frequency, said field defining a transponder capture zone along and above said roadway lane and extending across said lane width for communicating with said transponder; and

    ,interrogator output means supplying alternating current at said frequency to said radiating elements.

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