NDLI: Performance characteristics of a 300-GHz radiometer and some atmospheric attenuation measurements

Content Provider	IEEE Xplore Digital Library
Author	Chang, S. Lester, J.
Copyright Year	1963
Abstract	A 300-GHz Dicke-type superheterodyne radiometer receiver was used for measurements of atmospheric attenuation of electromagnetic waves over an open path at frequencies near 300 GHz. The average measured values of horizontal attenuation at 304 GHz and 316 GHz, presumably due to atmospheric water vapor absorption, were, respectively, 3.35 dB/km and 5.55 dB/km per g/m³of water vapor density. Absorption variations at 304 GHz with respect to water vapor density were shown in the measured results. The variation of the effective zenith sky temperature with respect to atmospheric water vapor density was also determined. The minimum detectable temperature difference(\Delta T)_{min}, was obtained by measuring the rms value of noise in the receiver output. The best value achieved was3.16\degK. Based on this result, the receiver noise figure and the mixer conversion loss were determined indirectly. The results were 31.4 dB and 22.9 dB, respectively. A blackbody radiation source served to calibrate the radiometer.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	588
Ending Page	591
Page Count	4
File Size	408958
File Format	PDF
ISSN	0018926X
Volume Number	16
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1968-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radiometry Attenuation measurement Atmospheric measurements Atmospheric waves Electromagnetic measurements Density measurement Temperature Frequency measurement Electromagnetic scattering Electromagnetic wave absorption
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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