Compact Circularly Polarized Patch Antenna with Enhanced Axial Ratio and Impedance Bandwidth

This paper presents a novel design of a wideband circularly polarized (CP) patch antenna based on an aperture-coupled feeding method. The properties of the CP structure are derived by introducing a novel coupled resonator-based configuration, which incorporates the inherent 90 degrees phase difference between the two coupled resonant channels. The proposed low-profile patch antenna aims to enhance the impedance and axial ratio (AR) bandwidth. In contrast to prior works, the antenna demonstrates a reduced physical size with the smallest thickness of 0.08 free space wavelength, while also showcasing broad impedance and 3 dB axial ratio bandwidths. This antenna can be used in satellite communication applications to maintain the quality of signal in a wide range of frequencies simultaneously with the low axial ratio in the wide impedance bandwidth for mobile satellite services.