基于平板波导的双频双极化CTS阵列天线设计研究

Design of dual-frequency and dual-polarization CTS array antenna based on parallel plate waveguide

针对卫星通信天线轻量化和辐射孔径复用等需求,对双频段双极化连续切向节(Continuous Transverse Stub,CTS)阵列天线进行研究。天线采用正交共口径设计,结合标准波导接口的带通滤波器和独立功分馈电网络实现了高极化隔离度特性;通过对枝节辐射能力控制和天线阵列设计,达到了兼顾增益特性的同时降低旁瓣电平的目的。仿真结果显示:天线分别在18.5~21.2 GHz和27.5~31 GHz两个频段内回波损耗小于-10 dB,旁瓣电平均小于-12 dB,端口隔离度优于80 dB,增益分别为24~27 dBi和25~27 dBi,结构简单,易于加工,剖面高度低,易于运输和共形安装。

In this paper,the continuous polarization continuous tangent stub(CTS)array technology is studied to meet the requirements of satellite communication antenna lightness and radiation aperture reuse.The antenna is designed by orthogonal common aperture,combined with standard waveguide interface bandpass filter and independent power distribution feed network to achieve high polarization isolation.Through the radiation capability of the branches and the array design,the gain characteristic is good and the sidelobe level is reduced.The simulation results show that the return loss of the antenna is less than-10 dB in 18.5~21.2 GHz and 27.5~31 GHz respectively,the average side lobe is less than-12 dB,the port isolation is better than 80 dB,and the gain is 24~27 dBi and 25~27 dBi respectively.The structure is simple,easy to process,low profile height,easy to transport and conformal installation.