Abstract
A compact circular polarized (CP) antenna with wide beamwidths for CNSS applications is proposed in this paper. The CP radiation is produced by four compact symmetrically arranged inverted-F monopoles which are excited through a compact sequential phase feeding network with a 90° phase delay, where the four monopoles. Each inverted-F monopole contains a printed-inductor to reduce the length of primary radiating element. The overall dimension of the proposed antenna is only $0.17 \lambda_{0}\times 0.17\lambda_{0}\times 0.09 \lambda_{0}$ , where $\lambda_{0}$ is the corresponding free-space wavelength at 1.268 GHz. Simulated results show that the proposed antenna exhibits an impedance bandwidth of 111 MHz (1.211-1.322 GHz) and an axial ratio (AR) bandwidth of 61 MHz (1.242~1.303 GHz). At 1.268 GHz of the CNSS-B3 band, the antenna has an RHCP gain of 3.7 dB, a radiation efficiency of 88.6%, a 3dB AR beamwidth of 107°/100° (XOZ /YOZ planes) and wide half power beamwidths (HPBWs) of about 131°/120° (XOZ /YOZ planes). With these good performances, the antenna can be a good candidate for the CNSS applications.
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