Characteristics of Superconductor Strip Transmission Lines with Periodic Load

Abstract

The characteristic impedance and propagation constant of a thin film superconducting strip transmission line has been derived by use of London's two fluid model. It is shown that this line at moderate frequency has negligible attenuation and dispersion. A periodically loaded cross film cryotron circuit is also analyzed. The attenuation, phase constant, and characteristic impedance of this loaded line is given and related to the parameters of the unloaded line by the factor K which is the ratio of the gate separation to the gate width.