volume | PIER Journals

Abstract

In this paper, a broadband circularly polarized (CP) microstrip antenna array for S-band is proposed. The antenna consists of a parallel rotating feed network, sixteen units with cut corners, adding rectangular perturbations, and the guided patches with 45˚ oblique rectangular slots. The guided patches increase the impedance bandwidth of the antenna, and the feed network with a 90˚ phase difference increases the axial ratio bandwidth. The simulation and measurement results show that the S₁₁ curve is 2.45~4.15 GHz; the impedance bandwidth is 51.5%; the frequency with the axial ratio less than 3 dB is 2.54~3.74 GHz; the working bandwidth is 1.2 GHz; the CP bandwidth is 38.2%; the gain is 18.72 dB at the S-band center frequency. The advantages of the designed antenna are high gain, wide bandwidth, and a good radiation pattern. It can be applied to early warning radar in S-band. It also completely covers China Mobile's 2.6 GHz spectrum and can be used as a base station antenna if taking no account of the polarization method. The antenna has a simple structure, which is suitable for applications.

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Dr. Mingming Gao

Dr. Pengju Yang

Dr. Jingchang Nan