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Superconducting Thin-Film Transformers at Microwave Frequencies
Published
Author(s)
A. H. Miklich, J. X. Przybysz, T. J. Smith, Samuel Benz, Todd E. Harvey
Abstract
We describe the use of thin-film superconducting transformers at frequencies up to 20 GHz. Transformers with turns ratios of 2,3, and 7 were fabricated out of Nb and tested in a liquid-He Dewar. The measured S-parameters showed considerably less bandwidth than predicted based on a consideration of the lumped-element inductances of the circuit elements. We present an alternative model for the transformer where each part of the patterned circuit is treated as a distributed element (a transmission line). Despite the simplicity of the model, simulations using it agree well with the measured data without using any fitted parameters. These simulations take only a few minutes to compute on a typical workstation, making the model well suited as a design tool.
Citation
IEEE Transactions on Applied Superconductivity
Volume
9
Issue
2
Pub Type
Journals
Keywords
microwave, superconducting, transformer, transmission line
Miklich, A.
, Przybysz, J.
, Smith, T.
, Benz, S.
and Harvey, T.
(1999),
Superconducting Thin-Film Transformers at Microwave Frequencies, IEEE Transactions on Applied Superconductivity
(Accessed May 29, 2023)