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Square-ring microstrip antenna with a cross strip for compact circular polarization operation

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3 Author(s)
Wen-Shyang Chen ; Dept. of Electron. Eng., Cheng-Shiu Inst. of Technol., Kaohsiung, Taiwan ; Chun-Kun Wu ; Kin-Lu Wong

A novel design of square-ring microstrip antenna with a cross strip for achieving compact circular polarization (CP) operation is proposed and experimentally studied. The cross strip can be placed in the centerlines or diagonals of the square-ring patch. Either design can make its excited fundamental mode patch surface current path much longer than that in a conventional square microstrip antenna with same antenna size. By incorporating a small tuning stub for splitting the fundamental mode into two near-degenerate resonant modes with equal amplitudes and 90° phase-difference compact CP operation for the proposed design can he obtained

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:47 ,  Issue: 10 )