Title :
Pb/Bi/In and Nb/Al junctions for a 345 GHz open structure astronomical receiver
Author :
Gundlach, K.H. ; Grassl, C. ; Billon-Pierron, D. ; Rothermel, H.
Author_Institution :
Inst. de Radio Astronomie Millimetrique, Domaine Univ., Saint Martin d´Heres, France
fDate :
3/1/1993 12:00:00 AM
Abstract :
The authors report on the preparation and properties of Pb/Bi/In-oxide-Pb/Bi and Nb-Al oxide-Nb junctions prepared for a 345-GHz open-structure heterodyne receiver. The lowest receiver noise temperature with the Pb/Bi/In junctions is 215 K DSB. In this case, no matching network is integrated to tune out the junction capacitance. For the Nb/Al junctions, a microwave transmission line compensates the capacitance around 345 GHz. With the Nb-Al oxide-Nb two-junction array at 4.2 K, the lowest receiver noise temperature is 80 K at 330 GHz. The receiver is in use at the IRAM (Institut de Radio Astronomie Millimetrique) 30-m radio telescope in Spain.<>
Keywords :
Josephson effect; aluminium; bismuth; indium; lead; mixers (circuits); niobium; radio receivers; radiotelescopes; submillimetre wave devices; superconducting junction devices; superconducting microwave devices; 330 to 345 GHz; IRAM; Nb-AlO-Nb junctions; Pb-Bi-InO-Pb-Bi; THF; astronomical receiver; capacitance compensation; heterodyne receiver; junction capacitance; microwave transmission line; open structure; radio telescope; receiver noise temperature; Bismuth; Capacitance; Dipole antennas; Electrodes; Lead; Low pass filters; Niobium; Receivers; Temperature; Wiring;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
