Title :
A space-qualified low-noise 22 GHz receiver with high phase stability for VLBI-measurements
Author :
Piironen, P. ; Mallat, J. ; Raisanen, A. ; Jukkala, P.
Author_Institution :
Radio Lab., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
A space-qualified low-noise 22 GHz receiver for the international space-VLBI mission Radioastron has been constructed. The microwave electronics have been realized by using thermally matched microstrip structures. The most important properties of the receiver are phase stability, sensitivity and reliability. Phase stabilities of better than 0.13/spl deg/spl deg/C and 0.2/spl deg/spl deg/C for the receiver and the LNA units were measured, respectively. The measured receiver noise temperature with a cooled HEMT LNA is less than 100 K. The reliability requirement of 0.97 for a three year mission is also fulfilled.<>
Keywords :
microstrip components; radio receivers; radioastronomical techniques; radiowave interferometry; 22 GHz; 3 year; Radioastron; VLBI-measurements; cooled HEMT LNA; international space mission; low-noise receiver; noise temperature; phase stability; reliability; sensitivity; thermally matched microstrip structures; HEMTs; Measurement units; Microstrip; Noise measurement; Phase measurement; Stability; Temperature measurement; Temperature sensors;
Conference_Titel :
Microwave Symposium Digest, 1994., IEEE MTT-S International
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-7803-1778-5
DOI :
10.1109/MWSYM.1994.335165
