The moments method is applied to a Green's function formulation of the static solution of a microstrip line with pulses as basis functions and Dirac deltas or pulses as testing functions. The system capacitance per unit length is computed both directly from the charge distribution and from a variational expression and the results compared. The pulses are defined on subintervals of length in geometric progression, and the effect of the ratio on the results analysed. Conclusions about its optimum value are also given. The condition of the system, using the 1 norm, is studied as a test of the quality of the results. The strong connection between its behaviour and both the convergence of the capacitance and the charge distribution is shown.

Peer Reviewed