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Dual polarization antenna and RFID reader employing the same

  • US 7,427,955 B2
  • Filed: 12/07/2005
  • Issued: 09/23/2008
  • Est. Priority Date: 12/08/2004
  • Status: Expired due to Fees
First Claim
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1. A dual polarization antenna, comprising:

  • a ground plate;

    first and second inverted F-type radiators set up on the ground plate in confrontation to each other; and

    third and fourth inverted F-type radiators set up on the ground plate in confrontation to each other, wherein currents of the same phase are fed to the first and second inverted F-type radiators; and

    currents of an inverted phases are fed to the third and fourth inverted F-type radiators, wherein the first and third inverted F-type radiators form an angle of 90°

    with one another; and

    the second and fourth inverted F-type radiators form an angle of 90°

    with one another; and

    the first and second inverted F-type radiators form an angle of 0°

    with one another;

    and the third and fourth inverted F-type radiators form an angle of 0°

    with one another.

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