L波段金属光子晶体TEM-TE_(11)模式转换器实验研究

介绍了光子晶体模式转换器将TEM模转换为TE11模的验证实验测试结果。数值仿真得到中心频率1.31GHz上,该模式转换器转换效率大于99%;在1.27~1.376GHz频率上,模式转换器效率大于90%,相对带宽为8.1%。先后对其开展了微波暗室中的冷测实验以及在加速器平台上的热测实验,实验测试的辐射方向图结果与数值计算结果基本一致,输出微波模式均为典型的TE11模分布。热测实验表明所设计的模式转换器具有GW级功率容量。

Experimental study of L-band metallic photonic crystal TEM-TE11 mode converter

A metallic photonic crystal TEM-TE11 mode converter is designed and its testing results are presented. Simulation results show that its conversion efficiency is above 99% at the center frequency of 1.31 GHz. In the frequency range of 1.27-1.376 GHz, the conversion efficiency exceeds 90%, with a corresponding bandwidth of 8.1%. A TEM mode excitation and a horn antenna are fabricated to test the performance of the mode converter. The mode converter is also tested with a magnetically insulated transmission line oscillator (MILO) tube. The whole device works well. The photonic TEM-TE11 mode converter is capable of handling GW level high power microwave. The measured radiation patterns of the mode converter agree well with the simulated results, indicating that the simulated results are valid.