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Progress In Electromagnetics Research Letters
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A COMPACT CIRCULARLY POLARIZED MICROSTRIP ANTENNA WITH BANDWIDTH ENHANCEMENT

By L. Li, J. Li, B. He, S. Zhang, and A. Zhang

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Abstract:
ƒA novel compact circularly polarized microstrip antenna (CPMA) with bandwidth enhancement is proposed and studied. By employing capacitive loading and inductive loading, the size miniaturization is achieved. The cross-shaped aperture in the ground plane is able to excite two orthogonal modes. The near-equal amplitudes and 90° phase difference between these two modes are realized by properly designing the feed network, i.e., a 0°-90° hybrid comprising a 3-dB Wilkinson power divider cascaded with a 90° phase shifter. The proposed antenna exhibits a global bandwidth of 11.5% ranging from 1.88 GHz to 2.11 GHz with an overall size 50 mm × 50 mm × 6.8 mm (0.33λ0 × 0.33λ0 × 0.045λ0). The global bandwidth is defined where return loss is larger than 10 dB, broadside axial ratio (AR) smaller than 3 dB, and gain above 0 dBic.

Citation:
L. Li, J. Li, B. He, S. Zhang, and A. Zhang, "A Compact Circularly Polarized Microstrip Antenna with Bandwidth Enhancement," Progress In Electromagnetics Research Letters, Vol. 61, 85-89, 2016.
doi:10.2528/PIERL16051302

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