一种用于移动卫星通信的变极化器

A Variable Polarizer for Satellite Communications on the Move

变极化装置是卫星通信天线关键设备之一。采用端射探针变换和对称转门结正交模结构设计了一种用于极化跟踪的快捷可变极化器,实现了射频信号两个正交极化分量的实时跟踪、分离和提取功能。电磁仿真和优化结果表明,设计的变极化器具有宽频带和高极化隔离性能,在Ku频段1.8GHz频带内,极化隔离度优于22d B,端口反射损耗小于-20d B。

The variable polarizer is the key equipment for antennas of satellite communication. A variable polarizer is designed using combined configuration of an end launcher probe and symmetrical turnstile junction of orthomode transducer. The functions of real-time tracking, separation and extraction of the two H-V polarization RF signals can be realized by the variable polarizer. The proposed polarizer is simulated and optimized by the CST software. The simulation results show that the proposed polarizer has excellent characteristics of polarization isolation and broadband. Over 1.8GHz bandwidth in Ku-band, the polarization isolation between two H-V polarization channels is less than-22 d B, the return loss is less than-20 d B.