太赫兹准光混频器的设计与实现

Design and fabrication of quasi-optical mixers

设计了一种用于太赫兹接收机的准光混频器。该混频器主要由肖特基二极管集成平面天线和高阻硅透镜2部分组成,其中肖特基二极管的截止频率为3.5 THz。平面双缝天线、螺旋天线、对数周期天线分别与肖特基二极管进行一体化集成,再通过高阻硅透镜来消除介质表面波,以达到改善天线辐射性能的目的。所设计的准光混频器工作频率为340 GHz,并对该混频器的检波性能、方向图和混频性能进行了测试,其变频损耗小于15 d B。

Quasi-optical mixers for terahertz receiver are designed and realized. The quasi-optical mixers consist of two parts： an antenna integrated Schottky diode chip and a high-resistivity silicon lens. The cutoff frequency of the Schottky diode is 3.5THz. The planar double slot antenna, equiangular spiral antenna and balanced log-periodic antenna are integrated with the Schottky diodes respectively. The silicon lens is adopted to improve the radiation performance and reduce the surface waves. The operating frequency of quasi-optical mixers is 340GHz. The detection capability, radiation pattern and frequency conversion are measured. Its Double Side Band（DSB） conversion loss is below 15dB.