Noise temperature measurement of YBCO Josephson mixers in millimeter and submillimeter waves

Author

Shimakage, H. ; Uzawa, Y. ; Tonouchi, M. ; Wang, Z.

Author_Institution

Lab. of Commun. Res., Kansai Adv. Res. Centre, Kobe, Japan

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

2595

Lastpage

2598

Abstract

We have investigated YBCO step-edge Josephson junctions as millimeter and submillimeter wave mixers. These mixers were integrated with an Au thin-film log-periodic antenna designed for broadband coupling of the radiation. We estimated the noise temperature of the mixer using conventional hot/cold blackbody irradiation techniques in the 100- and 300-GHz bands. We found that the Au thin-film antenna yielded about 5 dB higher coupling efficiency than that of YBCO thin film antenna, and the noise temperature decreased from 2,800 K to 1,800 K. The best receiver noise temperature, 1,200 K, was achieved in the 300-GHz band through improvement in impedance matching.

Keywords

barium compounds; high-temperature superconductors; millimetre wave mixers; submillimetre wave mixers; superconducting device noise; superconducting device testing; superconducting junction devices; yttrium compounds; 100 GHz; 300 GHz; Au; Au thin-film log-periodic antenna; YBCO step-edge Josephson junction; YBaCuO; blackbody irradiation; broadband radiation coupling efficiency; impedance matching; millimeter wave mixer; receiver noise temperature measurement; submillimeter wave mixer; Gold; Josephson junctions; Submillimeter wave communication; Submillimeter wave technology; Substrates; Superconducting device noise; Superconducting thin films; Temperature measurement; Transistors; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.621770

Filename

621770