Longitudinal and Transverse Current Distributions on Microstriplines and Their Closed-Form Expression

Simple but accurate closed-form expressions for the normalized longitudinal and transverse current distributions on microstriplines are derived by rising the charge conservation formula and the charge distributions calculated by the Green´s function technique. Their dependence on both the relative permittivity of the substrate epsilon* and the shape ratio w/h are explained, and the results are compared with other available results. It is confirmed by comparison with other theoretical results that the present closed-form expressions are valid for an even higher frequency. The reasonable expression for the normalized transverse current distribution is believed to be the first.