Theory of digital phase shifters based on high-Tc superconducting films

A theory of digital phase shifters based on transition from a superconducting (S) state into a normal (N) state in high-Tc superconductor (HTS) films is developed. It is shown that the insertion-loss level in the phase shifters is determined by the commutation quality of the HTS film and does not de...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 1999-08, Vol.47 (8), p.1553-1562
Main Authors: Vendik, Irina B, Vendik, Orest G, Kollberg, Erik L, Sherman, Vladimir
Format: Article
Language:English
Online Access:Get full text
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Summary:A theory of digital phase shifters based on transition from a superconducting (S) state into a normal (N) state in high-Tc superconductor (HTS) films is developed. It is shown that the insertion-loss level in the phase shifters is determined by the commutation quality of the HTS film and does not depend on the S-N switching element shape and size. The procedure for designing the S-N phase shifter with minimum insertion loss is equivalent to designing a matching circuit for the termination Z = sq rt (R(S)R(N)) (R(S) and R(N) are the resistances of the switching element in the S- and N-states, respectively). Different versions of S-N phase shifters are suggested and discussed. High-quality S-N phase shifters can be successfully designed in a 1-10-GHz frequency range and find application on the receiving end of microwave systems. (Author)
ISSN:0018-9480
DOI:10.1109/22.780408