MODE-COUPLING AND LEAKAGE EFFECTS IN FINITE-SIZE PRINTED INTERCONNECTS

A multimode analysis is used to describe how leakage effects are manif ested in general printed interconnects situated on substrates of finit e size. In the vicinity of discrete frequencies, it is shown that the analysis reduces to classical coupled-mode theory. The general results are then specialized to the particular case of shielded microstrip on an anisotropic substrate, for which numerical and experimental mode-c oupling results are presented. The numerical results are demonstrated in the form of dispersion curves and field plots, and are computed usi ng the finite-element method and the spectral-domain technique. The ex perimental results are performed using a network analyzer, and are giv en in terms of scattering parameters.