On the Analysis of Electromagnetic Susceptibility of Superconducting Microstrip Transmission Lines in Oblique Incidence

Superconducting microwave circuits are composed of components made from superconducting microstrip transmission lines (SMTLs). The spatial features of the superconductors provide the system operation at high speed and low noise floor. However, coupling the external electromagnetic field in these systems reduces or nullifies their performance. In this article a general solution for evaluating the electromagnetic behavior of SMTL in different incidence angles is proposed. The analysis is portrayed in the spectral domain. Using the proposed approach, the electromagnetic susceptibility (EMS) of the line is evaluated for oblique incidence. It is investigated for different film thicknesses. The study reveals that the line's susceptibility has the highest value at 80o. But, its value varies for different thicknesses. Different behavior of the induced current for different thicknesses is due to the difference in equivalent impedance. Moreover, due to increase in the equivalent reactance, the line's susceptibility is decreased as the film thickness is decreased.