低剖面宽波束圆极化天线单元及其宽角扫描阵列设计OA

[Background]With the rapid development of low-Earth orbit(LEO)satellite communications,there is a pressing need for circularly polarized phased arrays that offer wide-angle scanning capability while maintaining a low profile,which remains a significant challenge in current designs.[Purpose]This study aims to design a low-profile,wide-beam circularly polarized antenna element and its corresponding wide-angle scanning array to address the limitations of narrow scan angles and high profiles in existing solutions.[Methods]A double-layer antenna element was designed,utilizing corner perturbation and cross-slots to achieve left-hand circular polarization,while the beamwidth was broadened via an upper parasitic structure and metallic posts based on pattern superposition.A 4×4 array was constructed by rotating these elements,with annular open slots integrated into the ground plane to suppress mutual coupling.[Results]The proposed antenna element exhibits a 3-dB axial ratio beamwidth greater than 175°,a gain beamwidth of 120°,and a profile of only 0.07λ0.Simulations of the 4×4 array demonstrate a scan coverage of±60°,with axial ratio consistently below 2 dB and a stable gain fluctuation of 3.38 dB throughout the scanning range.[Conclusions]The designed antenna and array effectively achieve wide-angle circularly polarized scanning with low profile and stable performance,offering a promising solution for LEO satellite communication terminals and other integrated systems requiring wide spatial coverage.