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Evaluation of coaxial cable performance under thermal gradients

Published online by Cambridge University Press:  30 March 2015

Sergio Colangeli ,
Riccardo Cleriti ,
Walter Ciccognani  and
Ernesto Limiti
Sergio Colangeli*
Affiliation:
Department of Electronic Engineering, University of Rome Tor Vergata, via del Politecnico 1, 00133 Rome, Italy. Phone: +39 7259 7343
Riccardo Cleriti
Affiliation:
Department of Electronic Engineering, University of Rome Tor Vergata, via del Politecnico 1, 00133 Rome, Italy. Phone: +39 7259 7343
Walter Ciccognani
Affiliation:
Department of Electronic Engineering, University of Rome Tor Vergata, via del Politecnico 1, 00133 Rome, Italy. Phone: +39 7259 7343
Ernesto Limiti
Affiliation:
Department of Electronic Engineering, University of Rome Tor Vergata, via del Politecnico 1, 00133 Rome, Italy. Phone: +39 7259 7343
*
Corresponding author: S. Colangeli Email: colangeli@ing.uniroma2.it
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Abstract

This paper presents a very flexible tool for numerically evaluating the small-signal and noise parameters of a transmission line subject to an arbitrary thermal gradient. Contrary to previous methods, the proposed approach allows straightforwardly taking into account possible variations of electrical parameters along the propagation direction, such as may be expected when temperature ranges between very different values. The main application of the proposed method is cable modeling in noise-figure measurement setups under cryogenic operation: in such circumstances, indeed, the coaxial cables (or waveguide) at the interface between the outside and the inside of the cryogenic chamber are subject to remarkable temperature excursions. As a consequence, significant de-embedding errors may arise if the cables are not correctly modeled, given the very low values of noise figure which are commonly exhibited by cryo-cooled active devices.

Keywords

Linear and non-linear CAD techniquesPassive components and circuits
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 7 , Special Issue 3-4: European Microwave Week 2014 , June 2015 , pp. 239 - 249
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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References

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