×

Low return loss rugged RFID antenna

  • US 20070096919A1
  • Filed: 11/03/2005
  • Published: 05/03/2007
  • Est. Priority Date: 11/03/2005
  • Status: Active Grant
First Claim
Patent Images

1. A radio frequency identification (RFID) device, comprising:

  • a quadrature hybrid coupler having first, second, third, and fourth ports, wherein the first port receives an input radio frequency (RF) signal, the second port outputs a first RF output signal, and the third port outputs a second RF output signal, wherein the second RF output signal is shifted in phase by 90 degrees relative to the first RF output signal;

    a termination element coupled to the fourth port; and

    a patch antenna having a first point coupled to the first RF output signal and a second point coupled to the second RF output signal, wherein the patch antenna radiates a circularly polarized RF signal.

View all claims
  • 4 Assignments
Timeline View
Assignment View
    ×
    ×