中文摘要：

超导SIS（Superconductor-Insulator-Superconductor）混频技术是新兴的低噪声检测技术,其卓越的低噪声性能使其成为太赫兹波段理想的接收技术之一.如何提高太赫兹波和SIS超导结之间的信号耦合是设计超导SIS混频器的一个关键问题.本文依据准光耦合技术,研究了两种改善两者间信号的耦合方法：一是设计工作于500GHz波段的对数周期天线,二是设计微带阻抗变换器以实现对数周期天线和SIS超导结之间的阻抗匹配.

英文摘要：

Superconducting SIS mixer technology is a new low-noise detection technology. Its excellent low-noise performance made it one of the most important receiving technologies. How to improve the coupling ability between the SIS junction and the THz wave is a key item in the technology. This paper discussed two methods to improve the coupling according to the quasi-optical technology. One is the design of log-periodic antenna at 500GHz band,and the other is the design of a microstrip impedance converter.