| Summary: | 碩士 === 國立交通大學 === 電信研究所 === 81 === A new and generalized spectral domain approach is used to
derive dispersion characteristics of transmission lines with
different sidewall widths in different layers. The new
formulation utilizes the equivalence principle to separate two
different regions. Magnetic surface currents are identified as
the unknowns at the aperture separating the two regions. The
resulting equivalences can then be treated with the immittance
approach as in conventional spectral domain approach. The
formulation procedure is systematic and can treat a variety of
structures. It is applied to analyze the effects of metal
thickness and mounting grooves on propagation characteristics
of finlines. The CPW with finite metal thickness, microshield
line, and CPW airbridge could also be treated. Further, the
generalized spectral domain approach combined with
perturbational method, is used to characterize the skin effects
of finlines. This method is used to take into account the
influence of metallization thickness on the conductor loss. The
effects of mounting grooves, fin width of finlines, and
enclosing sidewalls are also discussed.
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