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Design and analysis of an all-NbN SIS mixer using a tuning circuit with two half-wavelength distributed junctions

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4 Author(s)
Y. Uzawa ; Kansai Adv. Res. Center, Commun. Res. Lab., Kobe, Japan ; M. Takeda ; A. Kawakami ; Zhen Wang

We have designed an all-NbN superconductor-insulator-superconductor mixer with a broadband tuning circuit for the terahertz band, which enables the use of junctions with a lower current density. It uses the reactance compensation efficiently produced by two half-wavelength distributed junctions connected by a half-wavelength microstripline. Based on the design and simulated noise performance, a tuning circuit using NbN junctions with a current density of 25 kA/cm2 should be able to cover the 780-950 GHz band with an SSB receiver noise temperature below 4hfkB.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:13 ,  Issue: 2 )