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本文设计了一种宽带Ka波段圆极化波导缝隙天线。在波导宽边开并联纵缝,从波导耦合电磁波至其上方开有带一对方片微扰的宽缝的金属腔体圆极化器中,实现圆极化辐射。宽缝可以获得较宽的轴比带宽。本文重点研究了腔体尺寸对天线带宽的影响,优化了阻抗带宽与轴比带宽的匹配。在提取单元谐振电导的基础上,设计了工作在35GHz的1×8圆极化波导缝隙阵列。天线中心频率处的增益为16.2d B,第一副瓣电平为-17d B,阻抗带宽约为5.57%,相对轴比带宽5.6%。
In this paper, a wideband Ka-band circularly polarized waveguide slot antenna is designed. A parallel circular slit is formed on the broadside of the waveguide, and the circularly polarized radiation is realized in a metal cavity circular polarizer having a broad slit with a pair of square perturbations coupled from the waveguide to the electromagnetic wave. Wide slit can get a wider shaft than the bandwidth. This article focuses on the influence of the cavity size on the antenna bandwidth and optimizes the matching of the impedance bandwidth to the axial bandwidth. On the basis of extracting the resonant conductance of a unit, a 1 × 8 circularly polarized waveguide slot array operating at 35 GHz is designed. The gain at the antenna center frequency is 16.2d B, the first sidelobe level is -17d B, the impedance bandwidth is about 5.57% and the relative axis bandwidth is 5.6%.