A novel single-feed structure for circularly polarised square patch antennas is proposed and theoretically studied. The proposed antenna has a simple structure, consisting of a square radiating patch and an asymmetrical Y-shaped microstrip feed line. The two orthogonal modes with equal amplitude and ±90° out of phase are simultaneously excited by the suggested feed structure with two different branch lengths. It is shown that the proposed antenna has good circular polarisation characteristic.
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Youngje Sung (2010) studied this question.
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