Title :
A Simple Integrated Matching Element for SIS Quasiparticle Mixers
Author :
Raisanen, A.V. ; McGrath, W.R. ; Richards, P.L. ; Lloyd, F.L.
Abstract :
An integrated superconducting microstrip is shown to be a convenient, flexible, and well characterized matching element for a superconductor-insulator-superconductor (SIS) heterodyne mixer. An open-circuited microstrip stub that reflects a parallel inductance across the junction is used to broaden the bandwidth of the RF match of a 30-40 GHz SIS mixer. Measurements with Pb-alloy junctions in a full-height waveguide mixer with fixed mechanical tuning give an instantaneous bandwidth of 10 to 15 percent with a mixer noise temperature T/sub M/(DSB)=10+-2.5 K.
Keywords :
Bandwidth; Inductance; Josephson junctions; Mechanical variables measurement; Microstrip; Noise measurement; Radio frequency; Superconducting device noise; Superconducting devices; Waveguide junctions;
Conference_Titel :
Microwave Symposium Digest, 1985 IEEE MTT-S International
Conference_Location :
St. Louis, MO, USA
DOI :
10.1109/MWSYM.1985.1132070
