Title :
Low noise log-periodic SIS open structure receiver at 180 and 305 GHz
Author :
Fernández, José A López ; Lehnert, T. ; Mattiocco, F.
Author_Institution :
Centro Astronómico de Yebes Apartado de Correos 148, 19080 Guadalajara, Spain TEL. +34 11 290311; FAX: +34 11 290063, e-mail: Lopez@cay.es
Abstract :
Two open structure heterodyne receivers have been designed and tested at 180 and 305 GHz. The RF signal is coupled via a seven teeth optimized log-periodic planar antenna to the mixer. The beam efficiency of the antenna is 70%. The coupling efficiency to the fundamental gaussian mode is higher than 90%. The mixer incorporates a series array of two SIS Nb-Al/AlOx-Nb junctions. Double side band noise temperatures of 95 K at 190 GHz and 160 K at 305 GHz have been measured.
Keywords :
Antenna measurements; Frequency; Lenses; Log periodic antennas; Millimeter wave technology; Planar arrays; Polarization; Substrates; Teeth; Temperature;
Conference_Titel :
Microwave Conference, 1993. 23rd European
Conference_Location :
Madrid, Spain
DOI :
10.1109/EUMA.1993.336777
