High frequency spectral analysis of superconducting microstrip lines

A dynamic analysis based on a spectral method is developped for superconducting lines. The propagation characteristics, the current densities distributions and the magnetic field are calculated for a simple or two coupled lines. The thicknesses of the strips are at the origin of an important dimensional effect. The propagation of even and odd modes is examined. For the lines operating at frequencies below several tenths of gigahertz, the results calculated by the spectral method are in good accordance with those obtained by a quasi-static method supposing the TEM approximation verified.