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

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4 Author(s)
I. B. Vendik ; Dept. of Radio Eng., Electrotech. Univ., St. Petersburg, Russia ; O. G. Vendik ; E. L. Kollberg ; V. O. Sherman

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=√RSRN (RS and RN 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

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IEEE Transactions on Microwave Theory and Techniques  (Volume:47 ,  Issue: 8 )