Full-wave loss analysis of normal- and superconducting transmission lines by hybrid-mode boundary integral equation method (MMICs)

The hybrid-mode boundary integral equation method is extended to full-wave analysis of arbitrary MMIC (monolithic microwave integrated circuit) transmission lines that incorporate superconductors and/or normal (imperfect) conductors and lossy dielectrics. The method is demonstrated for a thin-film microstrip line of small width. Attenuation and effective permittivity results for several configurations with Au and YBCO strips separated by medium and high permittivity films are compared. The advantages of the present approach are its ability to cope with arbitrary shielded or unshielded transmission line cross sections and its reliability owing to the elimination of the origin of spurious solutions.<
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