Title :
Integrated tuning elements for millimeter and sub-millimeter SIS mixers
Author :
Pance, G. ; Wengler, M.J.
Author_Institution :
Dept. of Electr. Eng., Rochester Univ., NY, USA
Abstract :
The authors present two different designs of integrated tuning elements for superconducting tunnel junction mixers. The structures consist of a self-complementary log-periodic antenna, superconductor-insulator-superconductor (SIS) tunnel junction, and a broadband superconducting tuning circuit placed between the center of the antenna and the SIS junction. The designs allow good coupling to relatively large-area (7 mu m/sup 2/) junctions. The best design has a 3-dB bandwidth of 102 GHz at the central frequency of 98 GHz, and 75 GHz at the central frequency of 492 GHz. Microwave scale-model measurements show excellent agreement with simulation results. Devices are being fabricated in niobium technology.<>
Keywords :
microwave antennas; mixers (circuits); niobium; superconducting junction devices; superconducting microwave devices; tuning; 102 GHz; 492 GHz; 75 GHz; 98 GHz; EHF; MM-wave mixers; Nb superconductors; SIS mixers; THF; bandwidth; broadband superconducting tuning circuit; central frequency; integrated tuning elements; large area junctions; log-periodic antenna; microwave scale-model; simulation results; sub-MM-wave mixers; superconducting tunnel junction mixers; superconductor-insulator-superconductor; Bandwidth; Broadband antennas; Circuit optimization; Coupling circuits; Frequency; Josephson junctions; Log periodic antennas; Microwave measurements; Superconducting devices; Superconducting microwave devices;
Conference_Titel :
Microwave Symposium Digest, 1992., IEEE MTT-S International
Conference_Location :
Albuquerque, NM, USA
Print_ISBN :
0-7803-0611-2
DOI :
10.1109/MWSYM.1992.187981
