Superconducting Thin-Film Transformers at Microwave Frequencies
A. H. Miklich, J. X. Przybysz, T. J. Smith, Samuel Benz, Todd E. Harvey
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.
IEEE Transactions on Applied Superconductivity
microwave, superconducting, transformer, transmission line
, Przybysz, J.
, Smith, T.
, Benz, S.
and Harvey, T.
Superconducting Thin-Film Transformers at Microwave Frequencies, IEEE Transactions on Applied Superconductivity
(Accessed December 7, 2023)