Statistics – Applications
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990msmr.book.....l&link_type=abstract
Millimeter-wave Schottky mixer receivers for applications in antenna measurements and radio astronomy., by Lehto, A. O.. Helsin
Statistics
Applications
Scientific paper
This thesis concentrates on whisker-contacted Schottky mixer receivers and on some of their applications. In this introductory part operation, noise sources, and construction of Schottky mixers and receivers are explained. An equivalent network of the embedding impedance seen by the mixer diode is presented in this paper. It is based on scaled model measurements and verified by comparing measured receiver noise performance with results given by computer simulations. Two room-temperature Schottky mixer receivers working at 110 GHz and 183 GHz have been used to solve certain problems in antenna measurements: the quality of anechoic chambers and absorber panels, and amplitude and phase patterns of two corrugated feed horns have been measured. Reflections in the quiet zone, which is the volume used for antenna measurements, were measured in three chambers. The phase patterns of the horns were measured by using a novel differential phase method which avoids problems associated with conventional phase measurement methods.
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