大功率介质腔滤波器设计

Design of a high power filter using dielectric resonators

针对腔体滤波器在低气压环境下容易发生功率击穿的难题,提出了一种高Q值介质腔滤波器的设计方法,可以有效地提高滤波器低气压功率放电的阈值,按照此方法,设计了一款TM模介质腔滤波器,使用CST、Ansoft Designer软件进行仿真和优化,使用矢量网络分析仪对制作的产品进行了性能测试,测试曲线和仿真曲线完全吻合,此滤波器能够在低气压(13~101 000 Pa)环境中通过20 W的功率信号,且滤波器Q值高,体积小。

Aiming at the problem that cavity filter is prone to power breakdown in low pressure environment, a design method of high Q value dielectric cavity filter was presented, which can effectively improve the threshold of low pressure power discharge of filter. A TM mode dielectric cavity filter was designed and simulated using CST and Ansoft Designer. The performance of the product was tested by vector network analyzer. The test curve and the simulation curve are in good agreement with each other. This filter can be in low pressure （1.3- 101 000 Pa） environment through the 20 W power signal, and the filter has high Q value and small volume.