Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........25l&link_type=abstract
Ph.D. Thesis Helsinki Univ. of Technology, Espoo (Finland). Radio Lab.
Astronomy and Astrophysics
Astronomy
Antenna Feeds, Electric Contacts, Millimeter Waves, Mixing Circuits, Radio Astronomy, Schottky Diodes, Whiskers (Crystals), Absorptance, Acoustic Measurement, Anechoic Chambers, Beams (Radiation), Horn Antennas, Radar Absorbers, Receivers, Systems Engineering
Scientific paper
Whisker contacted Schottky mixer receivers and some of their applications are addressed. As an introduction to more detailed study, for which references are given, the noise sources and construction of Schottky mixers and receivers are explained. A summary of the other studies is given: an embedding network for a single ended whisker contacted millimeter wave mixer; measurement of the amplitude and phase patterns of two corrugated feed horns; a method of measuring absorption losses and beam efficiencies of large reflector antennas at millimeter wave frequencies; the construction of of 40 to 50 GHz cooled Schottky mixer front end; a 75 to 95 GHz cooled Schottky mixer receiver.
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