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Proceedings Paper

Characteristics of IF bandwidth of NbN superconducting tunneling junction mixers
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Paper Abstract

Besides the sensitivity nearly approaching the quantum limit, the intermediate-frequency (IF) bandwidth is of particular interesting for Superconductor-insulator-superconductor (SIS) mixers for radio astronomy research. In this paper, we are going to present the characteristic of IF bandwidth of two type of NbN SIS mixers, Long distributed junctions and Parallel-connected twin junctions. Firstly, the relative mixer gain are measured with different IF load impedance (25Ω, 50Ω, 75Ω) for both two SIS mixers. And also the mixers gain with different IF load impedance is simulated to get the optimum IF load impedance over a relative large IF bandwidth (2-15GHz). Finally, an IF matching circuit is designed and measured associating with SIS mixers, the measurement results show that the mixers gain are flatter over a large IF bandwidth than with 50Ω IF load impedance.

Paper Details

Date Published: 18 November 2019
PDF: 6 pages
Proc. SPIE 11196, Infrared, Millimeter-Wave, and Terahertz Technologies VI, 111960Z (18 November 2019); doi: 10.1117/12.2535630
Show Author Affiliations
Lui D., Purple Mountain Observatory (China)
Key Lab. of Radio Astronomy (China)
M. Yao, Purple Mountain Observatory (China)
Key Lab. of Radio Astronomy (China)
Boliang Liu, Purple Mountain Observatory (China)
Key Lab. of Radio Astronomy (China)
Univ. of Science and Technology of China (China)
HongHu Li, Purple Mountain Observatory (China)
Key Lab. of Radio Astronomy (China)
Univ. of Science and Technology of China (China)
J. Li, Purple Mountain Observatory (China)
Key Lab. of Radio Astronomy (China)
S. C. Shi, Purple Mountain Observatory (China)
Key Lab. of Radio Astronomy (China)


Published in SPIE Proceedings Vol. 11196:
Infrared, Millimeter-Wave, and Terahertz Technologies VI
Cunlin Zhang; Xi-Cheng Zhang; Masahiko Tani, Editor(s)

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