Title :
A 230 GHz low noise subharmonically pumped SIS mixer
Author :
Xiao, K.C. ; Ogawa, H. ; Mizuno, A. ; Fukui, Y.
Author_Institution :
Nagoya Univ., Japan
Abstract :
A 230 GHz Low Noise Subharmonically Pumped (SHP) SIS mixer has been developed and tested at 115 GHz LO. The mixer has a two backshorts waveguide structure and employs an array of four 1.7 /spl mu/m/sup 2/ Nb/AlO/sub x//Nb SIS junctions in series with /spl omega/RnC/spl sim/3 at 230 GHz. Harmonic quantum mixing occurred over the whole experimental frequency range of 208-234 GHz (LO:114-117 GHz), with the corresponding DSB noise temperatures of lower than 150 K and a lowest value of 75 K at /spl sim/230 GHz. The present noise results are believed to be the lowest yet reported for a SHP mixer.
Keywords :
aluminium compounds; millimetre wave mixers; niobium; superconducting device noise; superconductor-insulator-superconductor mixers; 230 GHz; DSB noise temperature; Nb-AlO-Nb; Nb/AlO/sub x//Nb junction array; harmonic quantum mixing; low noise SIS mixer; subharmonic pumping; waveguide structure; Band pass filters; Inductors; Local oscillators; Niobium; Power harmonic filters; Quantum mechanics; Radio frequency; Temperature distribution; Testing; Waveguide junctions;
Conference_Titel :
Microwave Symposium Digest. 2000 IEEE MTT-S International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-5687-X
DOI :
10.1109/MWSYM.2000.861130
