Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977nacze..30..721z&link_type=abstract
Nachrichtentechnische Zeitschrift, vol. 30, Sept. 1977, p. 721, 722. Research supported by the Deutsche Forschungsgemeinschaft.
Astronomy and Astrophysics
Astronomy
Microwave Circuits, Mixing Circuits, Radio Astronomy, Radiometers, Schottky Diodes, Bandpass Filters, Broadband, Low Noise, Noise Temperature, Transmission Loss
Scientific paper
An uncooled Schottky barrier diode mixer is described which exhibits a single sideband conversion loss of 6-7 dB and a single sideband input noise temperature of 600-700 K. The type of construction, which is particularly suitable for development purposes, allows the easy changing of various parts or dimensions such as the diode, low-pass filter, waveguide height, and IF matching transformer. Cooling the mixer to 20 K reduces the noise temperature by a factor of about 2, while the conversion loss remains approximately constant. This mixer will be used in a radiometer for radio astronomical observations.
Haas Robert W.
Zimmermann Paul
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