Title :
Airborne Imaging System using Cryogenic Receiver Modules at 90 and 140 GHz
Author :
Vowinkel, B. ; Grüner, K. ; Süss, H. ; Reinert, W.
Author_Institution :
Physikalisches Institut der Universitÿt Köln, UniversitÿtsstraÃ\x9fe 14 D-5000 Köln 41, FRG
Abstract :
A high-resolution airborne imaging system has been developed that uses cryogenic receiver modules at 90 and 140 GHz. They consist of Schottky-barrier mixers followed by GaAs-FET IF amplifiers. The DSB receiver noise temperatures are 210 K for the 90 GHz and 250 K for the 140 GHz system. The instantaneous bandwidth is 2.5 GHz for both front-ends. Results of some flight tests are presented.
Keywords :
Bandwidth; Cryogenics; Frequency; Gunn devices; High-resolution imaging; Image resolution; Microwave imaging; Mirrors; Temperature sensors; Testing;
Conference_Titel :
Microwave Conference, 1983. 13th European
Conference_Location :
Nurnberg, Germany
DOI :
10.1109/EUMA.1983.333271
