Modeling of unusual nonlinear behaviors in superconducting microstrip transmission lines

There are unusual nonlinear behaviors in superconducting materials, especially at low temperatures. This paper describes the procedure to reliably predict this nonlinearity in superconducting microstrip transmission lines (SMTLs). An accurate nonlinear distributed circuit model, based on simultaneously considering of both quadratic and modulus nonlinearity dependences, is proposed. All parameters of the equivalent circuit can be calculated analytically using proposed closed-form expressions. A numerical method based on Harmonic Balance approach is used to predict nonlinear phenomena like intermodulation distortions and third harmonic generations. Nonlinear analyses of the SMTLs at the different temperatures and the input powers have been presented. This proposed model can describe the unusual behaviors of the nonlinearity at low temperatures, which are frequently observed in the SMTLs.

► Avoiding of considering just quadratic or modulus nonlinearity.
► Proposing a nonlinear model to predict unusual nonlinear behaviors at low temperatures.
► Description of temperature dependency of nonlinear behaviors in superconducting lines.
► Analytical formulation for each parameter in our proposed model.
► Obtaining very good results which shows this model can predict unusual nonlinear behavior.