Cross-Talk Between Superconducting Microstrip Transmission Lines

This article provides an efficient method for the calculation of the cross talk in superconducting microstrip transmission lines. In this regard, an integral equation is formed to describe the current distribution in the set of two coupled superconducting transmission lines. To evaluate the cross talk, one line is excited and the coupled current in the other line is calculated. The aspect ratio, the ratio of coupled current to the exciting current is utilized as a measure of cross talk. The procedure is verified through the well-known full-wave COMSOL multiphysics software. Finally, the cross talk is calculated for YBa
₂
Cu
₃
O
₇
(YBCO) superconducting films in different scenarios including different values for film spacing, film thickness, also different temperatures and frequencies. Results show that by decreasing the film spacing or operating temperature, the cross talk increases. The same behavior is seen for increasing the film thickness or decreasing operating frequency. This study shows that the dependency of cross talk on film width is decreased as the film spacing is increased. Similarly, the dependency of cross talk on temperature is decreased as the thickness of the films is increased.