A Quantum-limited Submillimeter Mixer with an Inhomogeneous Distributed SIS Junction Array

Author

Shan, WL ; Shi, S.C. ; Sekimoto, Y. ; Noguchi, T.

Author_Institution

Nat. Astron. Observatories of China, Nanjing

fYear

2007

fDate

18-21 April 2007

Firstpage

1

Lastpage

4

Abstract

Heterodyne mixing performance of a waveguide SIS mixer with inhomogeneous distributed junction (DJ) array composed of 3 SIS junctions is experimentally investigated at 375-500 GHz. Quantum-limited noise temperature of 3-DJ mixer is demonstrated. Besides its low noise temperature, the mixer conversion gain of 3-DJ mixer is found to be more uniform over RF band than that of a PCTJ (parallel-connected twin junctions) mixer. The FTS (Fourier transform spectrum) response indicates a broad RF bandwidth of the 3-DJ mixer that is limited by the bandwidth of waveguide probe instead of mixer´s tuning circuit.

Keywords

Fourier transform spectra; circuit noise; submillimetre wave mixers; superconducting arrays; superconductor-insulator-superconductor mixers; Fourier transform spectrum; SIS junction array; distributed junction mixer; frequency 375 GHz to 500 GHz; heterodyne mixing performance; inhomogeneous distributed junction array; quantum-limited submillimeter mixer; waveguide SIS mixer; Bandwidth; Circuit optimization; Current density; Observatories; Optical noise; Optical waveguides; Probes; Radio frequency; Temperature; Waveguide junctions; Distributed junction array; Gain flatness; Noise temperature; SIS mixers; Submillimeter wave;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave and Millimeter Wave Technology, 2007. ICMMT '07. International Conference on

Conference_Location

Builin

Print_ISBN

1-4244-1049-5

Electronic_ISBN

1-4244-1049-5

Type

conf

DOI

10.1109/ICMMT.2007.381463

Filename

4266222