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Design, simulation, and fabrication of broadband coaxial matched loads for the frequency range from 0 to 110 GHz

Published online by Cambridge University Press:  12 March 2014

Andreas Tag*
Affiliation:
Institute for Electronics Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstrasse 9, 91058 Erlangen, Germany
Jens Leinhos
Affiliation:
Rohde & Schwarz GmbH & Co. KG, Mühldorfstrasse 15, 81671 Munich, Germany
Gerd Hechtfischer
Affiliation:
Rohde & Schwarz GmbH & Co. KG, Mühldorfstrasse 15, 81671 Munich, Germany
Martin Leibfritz
Affiliation:
Rohde & Schwarz GmbH & Co. KG, Mühldorfstrasse 15, 81671 Munich, Germany
Thomas Eibert
Affiliation:
Insitute for High-Frequency Engineering, Technische Universität München, Arcisstrasse 21, 80333 Munich, Germany
*
Corresponding author: A. Tag Email: andreas.tag@fau.de

Abstract

Combining a theory for reflection-free termination of coaxial lines together with a novel manufacturing method results in 1-mm coaxial matched loads with an excellent absorption behavior over the frequency range from 0 to 110 GHz. Three different electromagnetic (EM) simulation approaches verify the capability of these matched loads to achieve reflection coefficients smaller than −43 dB over the entire frequency range. Matched loads with a maximum reflection coefficient of only −32 dB have been produced. An excellent performance was achieved by exponentially tapering the outer conductor over the region of a coaxial ceramic substrate coated by a thin-film resistance and by compensation for EM wave propagation inside the resistive coating.

Type
Research Paper
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2014 

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