宽温区超宽带中频系统关键技术研究

THz band is essential for research on dark matter and dark energy，distant objects in the early Universe，interstellar dust and molecular gases . It is also of great significance to understand formation and evolution of galaxies, and origin of life. Now，the demand for Terahertz detection devices is higher frequency, higher sensitivity, and large array. In response to this trend, the demand for intermediate-frequency (IF) system is ultra-wideband, high integration, low power-consumption. Over the years, new terahertz telescopes are built in the extreme site conditions such as high altitude mountains, polar, and space. It demand that IF systems need to maintain high performances over a wide temperature range. So, in this topic，it is proposed that research on key technologies of ultra-wideband IF system based on Low Temperature Co fired Ceram (LTCC) technology. And then will lay a solid technical foundation for Antarctic 5m THz telescope. It also be used in other fields such as biomedical, Earth's atmosphere, manned space THz astronomy programs.

太赫兹波段是观测研究暗物质与暗能量、早期遥远天体、星际尘埃和分子云物质等的重要波段，对于理解星系形成、演化和宇宙生命起源等都具有重要意义。目前，太赫兹天文探测装置正向更高频率、更高灵敏度和大规模阵列方向发展。相应地，要求中频系统具有超宽带、高集成度、低功耗等特点。同时，新型太赫兹望远镜多选择建在高海拔山区、极地、太空等极端工作台址，温度变化显著，对中频电路系统设计提出了更严格的要求。课题申请拟基于 LTCC 技术开展针对射电天文应用的超宽带高集成度宽温区中频系统关键技术研究。为我国南极天文台5米太赫兹望远镜项目及载人航天太赫兹天文计划等提供可靠的技术保证。

目前，太赫兹天文探测装置正向更高频率、更高灵敏度和大规模阵列方向发展。相应地，要求中频系统具有超宽带、高集成度、低功耗等特点。同时，新型太赫兹望远镜多选择建在高海拔山区、极地、太空等极端工作台址，温度变化显著，对中频电路系统设计提出了更严格的要求。课题申请开展针对射电天文应用的超宽带高集成度宽温区中频系统关键技术研究。为我国南极天文台5米太赫兹望远镜项目及载人航天太赫兹天文计划等提供可靠的技术保证。本课题开展了普通金属材料和低温超导材料的宽温特性研究；宽温区普通金属传输线和超导传输线微波性能研究；宽温区HEMT器件的性能表征与低温宽带低噪声放大器研究；具有任意相位延迟角度的3dB等功分器分析与45°功分器研究；十字结构及其在带通滤波器中的应用；以及宽带低温噪声温度测量装置和相位噪声测量装置的研究。