基于肖特基二极管的310 GHz紧凑型接收机前端

310 GHz compact receiver front-end based on Schottky diode

肖特基混频器是固态太赫兹接收系统的关键部件,与基于超导体-绝缘体-超导体混频器、热电子辐射热计混频器的接收机相比,基于肖特基二极管混频器构建的太赫兹接收机系统不依赖低温附属设备,具有成本低、重量轻、体积小、功耗低等优点。目前基于肖特基二极管混频器构建的太赫兹接收前端结构相对复杂,集成度普遍不高且损耗较大。针对太赫兹接收前端结构复杂、集成度低、损耗大等问题,基于太赫兹肖特基二极管设计了288~318 GHz二次谐波混频器及其本振驱动链路,并基于此混频器构建了太赫兹接收机系统。太赫兹接收机本振驱动链路由一个75 GHz的六倍频功放集成模块与一个150 GHz二倍频模块组成。本振链路的集成化设计使得该接收机集成度大大提高,集成模块尺寸为20 mm×20 mm×43 mm,测试结果表明:在288~318 GHz带宽内,实测的双边带变频损耗为5.8~9.4 dB,噪声温度为1055~1722 K,具有良好的射频性能。

Schottky mixer is the key component of terahertz receiving system.Compared with the receiver based on SIS(superconductor-insulator-superconductor)mixer and HEB(hot-electron bolometer)mixer,the terahertz receiver system constructed on the basis of Schottky diode mixer does not rely on low-temperature accessory equipment,and it has the advantages of low cost,light weight,small volume and low power consumption.At present,the structure of terahertz receiver front-end based on Schottky diode mixer is relatively complex.To solve the problems of complex structure,low integration and high loss of terahertz receiver front-end,a 288−318 GHz subharmonic mixer based on Schottky diode and its local oscillation channel is proposed.Accordingly,a terahertz receiver system based on this mixer is constructed.The terahertz receiver’s local oscillation channel consists of a 75 GHz sextupler,a power amplifier integrated module and a 150 GHz frequency doubler.The integrated design of the local oscillator channel makes the receiver integration greatly improved.The overall size of the integrated module is 20 mm×20 mm×43 mm.The final test of the receiver shows that:in the bandwidth of 288−318 GHz,the double sideband conversion loss of the receiver is 5.8−9.4 dB,and the noise temperature is 1055−1722 K,which has good RF performance.