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Spherical antenna pattern(s) from antenna(s) arranged in a two-dimensional plane for use in RFID tags and labels

  • US 5,719,586 A
  • Filed: 01/11/1996
  • Issued: 02/17/1998
  • Est. Priority Date: 05/15/1992
  • Status: Expired due to Term
First Claim
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1. A radio frequency (RF) transceiver system comprising first and second sending/receiving units wherein at least one of the units contains multiple antennas constructed in a planar arrangement, said planar arrangement creating a spherical electromagnetic antenna pattern, wherein said multiple antennas comprise at least one dipole antenna and consist of a single loop antenna formed in a planar arrangement thereby creating a toroidal shaped electromagnetic field centered about each antenna axis and resulting in said spherical electromagnetic pattern.

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