Abstract
A broadband high-gain circularly polarized (CP) microstrip antenna operating in X band is proposed. The circular polarization property is achieved by rotating four narrow band linearly polarized (LP) microstrip patch elements in sequence. Since the conventional series-parallel feed network is not conducive to the miniaturization of the array, a corresponding simplified feed network is designed to realize the four-way equal power division and sequential 90° phase shift. With this feed network, the impedance bandwidth (IBW) of the CP array is greatly improved compared with that of the LP element, while maintaining a miniaturized size. Then, parasitic patches are introduced to enhance the axial ratio bandwidth (ARBW). A prototype of this antenna is fabricated and tested. The size of proposed antenna is 0.93λ0 × 0.93λ0 × 0.017λ0 (λ0 denotes the space wavelength corresponding to the center frequency 10.4 GHz). The measured 10-dB IBW and 3-dB ARBW are 13.6% (9.8-11.23 GHz), 11.2% (9.9-11.07 GHz) respectively, and peak gain in the overlapping band is 9.8 dBi.
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