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工作在太赫兹波段的超导隧道结混频器具有接近量子极限的探测灵敏度,是亚毫米波段射电天文研究的重要探测技术。中频带宽的扩展对于提高总功率观测灵敏度,提高观测效率和实现高红移天体观测具有重要意义。本文主要采用量子混频理论结合电磁场理论,对氮化铌超导隧道结混频器中频特性进行数值模拟研究,研究结果对设计超导隧道结混频器和后端系统(低噪声放大器)都具有重要的意义。
The superconducting tunnel junction mixer operating in the terahertz band has detection sensitivity close to the quantum limit and is an important detection technique for sub-millimeter radio-frequency astronomy research. The expansion of the IF bandwidth is of great significance for improving the overall power observation sensitivity, improving the observation efficiency and achieving high red-shifted astrometry observations. In this paper, we mainly use the theory of quantum mixing and the theory of electromagnetic field to simulate the IF characteristics of Niobium nitride superconducting tunnel junction mixer. The results show that the design of superconducting tunnel junction mixer and back end system (LNA) It is of great significance.