volume | PIER Journals

Abstract

A novel wideband circularly polarized (CP) cross-dipole with wide 3 dB axial-ratio (AR) beamwidth is presented. To generate CP radiation, the cross-dipole is fed by a Wilkinson power divider which can provide 90° phase difference. The gain beamwidth and 3 dB AR beamwidth can be widened by the bent arm structures of cross-dipole and four vertical parasitic elements. As a result, the 3 dB AR beamwidth and gain beamwidth of the proposed antenna can achieve over 210° and 105°, respectively. It is observed that the impedance bandwidth (|S₁₁| ≤ -10 dB) of the proposed antenna is 1.2~2.0 GHz, and the AR bandwidth (AR ≤ 3 dB) is 1.28~1.76 GHz. The simulated and measured results are in good agreement, which shows that the proposed antenna is a good candidate for the application of satellite communications.

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Dr. Li-Xin Cao

Dr. Fu-Shun Zhang

Dr. Yi Zhao

Dr. Deng-Hui Li