A 200-285-GHz waveguide SIS mixer with an inhomogeneous distributed junction array

Author

Takeda, Masanori ; Noguchi, Takashi

Author_Institution

Dept. of Astronomical Sci., Graduate Univ. for Adv. Studies, Nagano, Japan

Volume

50

Issue

11

fYear

2002

fDate

11/1/2002 12:00:00 AM

Firstpage

2618

Lastpage

2623

Abstract

In this paper, we present the experimental results of a waveguide superconductor-insulator-superconductor (SIS) mixer with an inhomogeneous distributed junction array. The mixer consists of five Nb-AlO_x-Nb SIS junctions with different dimensions distributed on a superconducting microstrip. The critical current density of the fabricated junctions was 3100 A/cm². Detailed measurements of the receiver noise temperature have been made in the frequency range from 190 to 284 GHz at 4.2 K. A double-sideband (DSB) receiver noise temperature of 5 hw/k was obtained in the frequency range from 202 to 284 GHz and the lowest DSB receiver noise temperature of 46 K was obtained at 210 GHz.

Keywords

aluminium compounds; critical current density (superconductivity); microstrip lines; millimetre wave mixers; millimetre wave receivers; niobium; superconducting arrays; superconducting device noise; superconducting microwave devices; superconductor-insulator-superconductor mixers; 200 to 285 GHz; 4.2 K; Nb-AlO-Nb; corrugated feed horns; critical current density; double-sideband receiver noise temperature; heterodyne receiver; inhomogeneous distributed junction array; microwave computer-aided design; multiple junctions; normal-state resistance; optimized junction array; receiver noise temperature; superconducting microstrip; waveguide superconductor-insulator-superconductor mixer; Bandwidth; Critical current density; Frequency; Josephson junctions; Mixers; Superconducting device noise; Superconducting devices; Superconducting transmission lines; Temperature distribution; Waveguide junctions;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2002.804513

Filename

1046038