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The low-noise 115-GHz receiver on the Columbia-GISS 4-ft radio telescopeThe superheterodyne millimeter-wave radiometer on the Columbia-GISS 4-ft telescope is described. This receiver uses a room-temperature Schottky diode mixer, with a resonant-ring filter as LO diplexer. The diplexer has low signal loss, efficient LO power coupling, and suppresses most of the LO noise at both sidebands. The receiver IF section has a parametric amplifier as its first stage with sufficient gain to overcome the second-stage amplifier noise. A broad-banded quarter-wave impedance transformer minimizes the mismatch between mixer and paramp. At 115 GHz, the SSB receiver noise temperature is 860 K, which is believed to be the lowest figure so far reported for a room-temperature receiver at this frequency.
Document ID
19790041991
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Cong, H.-I.
(NASA Goddard Inst. for Space Studies New York, NY, United States)
Kerr, A. R.
(NASA Goddard Institute for Space Studies New York, N.Y., United States)
Mattauch, R. J.
(Virginia, University Charlottesville, Va., United States)
Date Acquired
August 9, 2013
Publication Date
March 1, 1979
Publication Information
Publication: IEEE Transactions on Microwave Theory and Techniques
Volume: MTT-27
Subject Category
Instrumentation And Photography
Accession Number
79A26004
Distribution Limits
Public
Copyright
Other

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