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RFID conveyor antenna

  • US 5,929,760 A
  • Filed: 10/20/1997
  • Issued: 07/27/1999
  • Est. Priority Date: 10/20/1997
  • Status: Expired due to Term
First Claim
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1. A RFID antenna system for communicating with at least one transponder moveable along an interrogation path having a substantially horizontal longitudinal plane, comprising:

  • an elongated antenna unit disposed proximate said interrogation path for interrogating said transponder moving along said interrogation path, said antenna unit including an elongated base having a substantially rectangular interior portion, a substantially planar antenna disposed within said base and a top removably engaged to said housing, said top comprising a RF transmissive material,said antenna comprising at least one substantially rectangular elongated loop of wire having a longitudinal axis, said longitudinal axis being disposed substantially perpendicular to said interrogation path, said loop of wire defining a planar surface, said loop of wire being substantially concentric with said base interior portion,said antenna providing transmitting and receiving electro-magnetic fields projected substantially perpendicular to said planar surface,said electro-magnetic fields being directed in a substantially vertical direction that intersects at least 40% of the width of said interrogation path.

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