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L-band radiometer design for long-term stability measurement of one-port devices

Published online by Cambridge University Press:  14 December 2011

Emilie Leynia de la Jarrige ,
Laurent Escotte ,
Eric Gonneau  and
Jean-Marc Goutoule
Emilie Leynia de la Jarrige*
Affiliation:
LAAS CNRS, 7 avenue du colonel Roche, 31077 Toulouse, Cedex, France. Université de Toulouse; UPS, INSA, INP, ISAE; LAAS; F-31077 Toulouse, France.
Laurent Escotte
Affiliation:
LAAS CNRS, 7 avenue du colonel Roche, 31077 Toulouse, Cedex, France. Université de Toulouse; UPS, INSA, INP, ISAE; LAAS; F-31077 Toulouse, France.
Eric Gonneau
Affiliation:
SIMAD, Université de Toulouse, F-31077 Toulouse, France.
Jean-Marc Goutoule
Affiliation:
EADS Astrium, 31402 Toulouse, France.
*
Corresponding author: E. Leynia de la Jarrige Email: eleyniad@laas.fr
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Abstract

The design of a high-stability radiometer is presented in this paper. It is used to characterize the stability of a microwave active cold load at L-band. The two-load radiometer takes advantage of a noise injection technique to improve its sensitivity. A temperature-stabilized enclosure is used to minimize gain and noise temperature fluctuations of the receiver. The radiometer sensitivity is 0.031 K and the gain fluctuations are less than 0.005 dB during 1 day. The total gain and the receiver noise temperature of the radiometer exhibit very small variations (<0.03 dB and 1 K, respectively) on the long term.

Keywords

RadiometerStabilityGain fluctuations
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 4 , Special Issue 1: IJMWT Special Issue on the 2011 National Microwave Days in France , February 2012 , pp. 119 - 126
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2011

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