Publication: Theoretical and numerical analysis of very high harmonic superconducting tunnel junction mixers
Issued Date
2007-03-13
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ISSN
00218979
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2-s2.0-33847693124
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Applied Physics. Vol.101, No.2 (2007)
Suggested Citation
P. Kittara, S. Withington, G. Yassin Theoretical and numerical analysis of very high harmonic superconducting tunnel junction mixers. Journal of Applied Physics. Vol.101, No.2 (2007). doi:10.1063/1.2424407 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/25131
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Title
Theoretical and numerical analysis of very high harmonic superconducting tunnel junction mixers
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Abstract
We describe a procedure for modeling the nonlinear, quantum-mechanical behavior of very high harmonic superconductor-insulator-superconductor (SIS) mixers. A typical mixer is pumped by a strong microwave source at 10-15 GHz, which causes high-harmonic (20-40) currents to flow, any one of which can be used as a local oscillator to downconvert a submillimeter-wave signal to a low microwave frequency, 1-8 GHz. This mode of operation is attractive for measuring the beam patterns of conventional SIS mixers, because only a single submillimeter-wave source is needed. We conducted simulations using the 20th harmonic of a 13.5 GHz microwave source, downconverting a 271.4 GHz signal to a 1.4 GHz intermediate frequency. These simulations clearly show that linear downconversion can be achieved even for relatively high levels of rf signal power; although, care is needed when choosing the operating point. The patterns of behavior seen in the simulations are in remarkable agreement with recently published experimental results. © 2007 American Institute of Physics.