Noise figure of HTS JJ MMIC downconverter at 12 GHz

Author

Suzuki, Kenji ; Yoshikawa, Shuhei ; Yamaguchi, Kazuhiro ; Hayashi, K. ; Fujino, S. ; Takenaka, Takashi ; Mitsuzuka, T. ; Enomoto, Yoshihide ; Imai, Koichi ; Suginoshita, F. ; Yazawa, N.

Author_Institution

SRL-ISTEC, Tokyo, Japan

fYear

1993

Firstpage

1429

Abstract

A YBa/sub 2/Cu/sub 3/O/sub 7- delta / (YBCO) step-edge microbridge JJ (Josephson junction), two 12-GHz YBCO microstrip bandpass filters, a 1-GHz YBCO filter, and current bias and voltage monitor circuits were successfully combined on a 20-mm*20-mm MgO substrate and integrated into a frequency downconverter for receiving DBS (direct broadcast satellite) signals. The YBCO downconverter and the GaAs low-noise IF (intermediate frequency) amplifier were combined in a microwave cryostat. The dependence of mixing signals on temperature and LO (local oscillator) input power was measured. The conversion gain and the noise figure corresponding to the YBCO downconverter package were -14.5 dB and 12.2 dB, respectively, at 15 K and low LO power (-25 dBm). The first demonstration of the HTS (high-temperature superconductive) subsystem, i.e. the monolithic YBCO downconverter, shows potential for applications in mobile radio communications and satellite broadcasting.<>

Keywords

Josephson effect; MMIC; direct broadcasting by satellite; electron device noise; frequency convertors; high-temperature superconductors; microstrip components; superconducting junction devices; superconducting microwave devices; 12 GHz; 12.2 dB; DBS; HTS JJ MMIC downconverter; Josephson junction; MgO; YBa/sub 2/Cu/sub 3/O/sub 7- delta /-MgO; conversion gain; frequency downconverter; input power; microstrip bandpass filters; microwave cryostat; mixing signals; mobile radio communications; monitor circuits; satellite broadcasting; step-edge microbridge; Band pass filters; Frequency; High temperature superconductors; Josephson junctions; MMICs; Microstrip filters; Microwave filters; Noise figure; Satellite broadcasting; Yttrium barium copper oxide;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 1993., IEEE MTT-S International

Conference_Location

Atlanta, GA, USA

ISSN

0149-645X

Print_ISBN

0-7803-1209-0

Type

conf

DOI

10.1109/MWSYM.1993.276729

Filename

276729