一种高功率微波金属片波导移相器设计与特性分析

A high power microwave metal piece waveguide phase shifter

设计了一种高功率微波矩形波导移相器,在矩形波导中平行于电场放置金属片,沿波导宽边移动金属片,实现波导内的可变相移。通过优化设计波导和金属片的结构尺寸可实现0~360°相移,通过优化设计金属片过渡匹配结构可实现较低的插损。设计波导内为全金属结构,不存在介质材料,采用真空绝缘可以承受较高的功率传输。设计了中心频率为9.4GHz的金属片波导移相器,移相器最大插损小于0.2dB,功率容量设计达到64 MW。实验测试,移相器最大插损小于0.5dB,相频曲线呈线性关系。

The phase shifter is a key part of high power phased antenna arrays whose beam of radiation can be steered. A high power rectangular waveguide phase shifter was designed. A metal piece is inserted into the waveguide paralleled with the nar- row sidewall of the rectangular waveguide. The metal piece brings an agitation of the electromagnetic field in the waveguide. Moving the metal piece in the waveguide along the wide sidewall direction leads to continuous shifting of phase. 0-360° phase shifting can be obtained by optimization of the structure of waveguide and metal piece. Low insertion loss can be achieved by opti- mization of structure of metal piece. The phase shifter is completely metallic, so that it can hold high power microwave transmis- sion. The operating frequency of the phase shifter is 9.4 GHz, and the length is 30 cm. The max shifting phase is 360°, the max insertion loss is less than 0.2 dB, the power handling capabilities of the shifter is more than 64 MW. The measured insertion loss is less than 0.5 dB, and the measured phase versus frequency is linear.