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Antenna device

  • US 6,707,433 B2
  • Filed: 10/25/2002
  • Issued: 03/16/2004
  • Est. Priority Date: 02/26/2001
  • Status: Expired due to Term
First Claim
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1. An antenna device comprising a plurality of concentric circle array antennas each having a different radius on an identical plane,wherein a plurality of element antennas are arranged circumferentially in each of the concentric circle array antennas, wherein said plurality of concentric circle array antennas are arranged at regular intervals d in most part thereof, and wherein the concentric circle array antennas corresponding to a remaining part of said plurality of concentric circle array antennas are arranged at intervals d±

  • (0.4 to 0.6)d.

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