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Coplanar waveguide-fed circularly polarized microstrip antenna

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2 Author(s)
Chih-Yu Huang ; Dept. of Electron. Eng., Yung Ta Inst. of Technol., Pingtung, Taiwan ; Kin-Lu Wong

Design of a square microstrip antenna for obtaining circular polarization (CP) radiation using a coplanar waveguide (CPW) feed is presented. This CP design is achieved by insetting a slit to the boundary of the square microstrip patch, which makes possible the splitting of the dominant resonant mode into two near-degenerate orthogonal modes for CP radiation and introducing an inclined slot in the CPW feed line for coupling the electromagnetic (EM) energy of the CPW to the square patch. Good impedance matching for CP operation can be obtained by adjusting the inclined slot length and the tuning-stub length of the CPW feed line. Typical experimental results are presented and discussed

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:48 ,  Issue: 2 )