A general analysis of the slow wave propagation along a superconducting stripline

The authors present a rigorous electromagnetic model for a multilayer stripline from which complex modal propagation constants are calculated. This model is used to demonstrate slow wave propagation along thin superconducting stripline structures, a result of a large fraction of the magnetic energy being stored in the superconducting film as the kinetic motion of paired electrons (kinetic inductance). The functional dependence of the propagation constant/phase velocity on the width of the center strip and the effective field penetration depth of the superconductor are shown.<>