一种S频段反射型可调模拟移相器的设计

设计了一种应用于S频段卫星通信相控阵系统的反射型可调模拟移相器。该移相器利用三分支线定向耦合器扩展了带宽，改善了工作频段内驻波；采用传输线和变容二极管构成的L型反射负载扩大了相移量。测试结果表明，在上行频段1.98～2.01 GHz内，相移量达到191°±1°,在下行频段2.17～2.2 GHz内，相移量达到186°±0.1°;插入损耗优于3.3 dB且插入损耗波动小于1 dB,回波损耗在整个电压调谐范围内均大于20 dB。该移相器结构简单、便于调节且价格低廉，在卫星通信领域有一定的应用价值。

Design of an S-band Reflection-Type Tunable Analog Phase Shifter

A reflection-type tunable analog phase shifter applied to phased array system for S-band satellite communication was designed. The phase shifter expanded the bandwidth and improved the standing wave in the working frequency band by using a three-branch directional coupler. The L-shaped reflection load composed of a transmission line and a varactor diode enlarged the phase shift. The measurement results show that the phase shift reach 191°±1° in the uplink frequency band from 1.98 GHz to 2.01 GHz, and 186°±0.1° in the downlink frequency band from 2.17 GHz to 2.2 GHz. The insertion loss is better than 3.3 dB, and the fluctuation of insertion loss is less than 1 dB. The return loss is greater than 20 dB in the whole voltage tuning range. The proposed phased shifter is simple in structure, easy to tune and low in price, and had certain application value in the field of satellite communication.