Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi 710024, China.
Rev Sci Instrum. 2023 Mar 1;94(3):034704. doi: 10.1063/5.0097739.
A novel T-shaped high-power waveguide phase shifter is investigated in this paper. The phase shifter consists of straight waveguides, four 90° H-bend waveguides, a stretching metal plate, and a metal spacer linked with the stretching metal plate. The entire structure for the phase shifter is symmetrical along both sides of the metal spacer. The phase-shifting principle for the phase shifter is to change the microwave transmission path by moving the stretching metal plate and then realize the linear phase adjustment. An optimal design approach of the phase shifter based on the boundary element method is described in detail. On this basis, a T-shaped waveguide phase shifter prototype with a center frequency of 9.3 GHz is designed. Simulation results show that the phase shifters can achieve 0°-360° linear phase adjustment by altering the distance of the stretched metal plate to 24 mm, and the efficiency of power transmission is more than 99.6%. In the meanwhile, experiments were conducted and the test results are in good agreement with simulation results. The return loss is more than 29 dB, and the insertion loss is less than 0.3 dB at 9.3 GHz in the entire phase-shifting range.
本文研究了一种新颖的 T 形高功率波导相移器。该相移器由直波导、四个 90° H 弯波导、一个拉伸金属板以及与拉伸金属板相连的金属间隔物组成。整个相移器结构在金属间隔物的两侧是对称的。相移器的相移原理是通过移动拉伸金属板来改变微波传输路径，从而实现线性相位调节。详细描述了基于边界元法的相移器的优化设计方法。在此基础上，设计了一个中心频率为 9.3GHz 的 T 形波导相移器原型。仿真结果表明，通过改变拉伸金属板的距离至 24mm，相移器可以实现 0°-360°的线性相位调节，功率传输效率大于 99.6%。同时，进行了实验，测试结果与仿真结果吻合良好。在整个相移范围内，回波损耗大于 29dB，插入损耗小于 0.3dB。
