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Abstract
Here, a circular polarized (CP) patch antenna with a wide 3-dB axial ratio beamwidth (ARBW) and suppressed backward cross-polarized radiation is proposed. A narrow slot is inserted into the ground to widen the 3-dB ARBWs of the CP antenna. An annular metal strip loaded with a circular row of L-shaped bent metal branches is etched around the circular radiation patch to reduce backward cross-polarized radiation, as well as to further increase the 3-dB ARBW. To validate, a prototype is designed at 1.575 GHz and fabricated. The experimental results show that the 10-dB impedance matching bandwidth of the fabricated prototype is 25.8%, and the 3-dB CP bandwidth is 5.1%. Besides, 3-dB ARBWs of 238° and 259° are obtained at the two principal planes, respectively, with the front-back ratio of more than 26 dB. Satisfactory agreement is achieved between measurement results and simulated ones.
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