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

Author

Uzawa, Yoshinori ; Takeda, Masanori ; Kawakami, Akira ; Wang, Zhen

Author_Institution

Kansai Adv. Res. Center, Commun. Res. Lab., Kobe, Japan

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

688

Lastpage

691

Abstract

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 4hfk_B.

Keywords

circuit tuning; niobium compounds; submillimetre wave mixers; superconductor-insulator-superconductor mixers; 780 to 950 GHz; NbN; SSB receiver noise temperature; all-NbN SIS mixer; broadband tuning circuit; current density; half-wavelength distributed junction; half-wavelength microstripline; reactance compensation; terahertz band; Amplitude modulation; Circuit noise; Circuit optimization; Circuit simulation; Current density; Josephson junctions; Microstrip; Superconducting device noise; Superconducting devices; Temperature;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.814002

Filename

1211696