小型化星载Ku频段宽带扇形波束圆极化天线

为适应星载天线小型化、宽带、高性能的发展趋势，提出一种小型化星载Ku频段宽带扇形波束圆极化天线。通过在H面扇形喇叭口处加入曲折线圆极化器实现天线圆极化，将传统平面圆极化器变为半圆柱形，天线的包络尺寸减小近36%。同时，在喇叭口处增加介质透镜，在有限尺寸内将球面波调节为平面波。半圆柱极化器和介质透镜的设计可共同调节入射波束角度，提升天线的宽角波束覆盖性能。利用CST软件建立模型进行仿真，仿真结果表明：天线结构紧凑、波束覆盖范围宽，俯仰面大于11.3dBi的增益覆盖范围达90°。半圆柱极化器的设计为星载天线的小型化、低成本设计提供新的思路。

Compact spaceborne Ku-band broadband fan-beam circular polarized antenna

A compact spaceborne Ku-band wideband fan beam circularly polarized antenna is proposed in this paper.It has a meander-line polarizer (MLP) which located in front of the horn to achieve circular polarized characteristics. By using a semi cylindrical circular polarizer, the size of the antenna is reduced by nearly 36%. Meantime, to adjust the spherical wave to a plane wave within a limited size, a dielectric lens is added at the edge of horn. The design of semi cylindrical polarizer and dielectric lens can jointly adjust the incident beam angle and improve the wide-angle beam coverage performance of the antenna. To validate the design theory, a Ku-band circular polarized antenna is designed and simulated by CST. The antenna has compact structure and wide beam gain is greater than 11.3dBi which the beam width of the elevation plane is more than 90°. The design of semi cylindrical polarizer provides a new idea for the miniaturization and low-cost design of spaceborne antenna.