A Nonradiating Finite-Gap Lumped-Port Model

A novel lumped-port model is presented to improve the accuracy of integral-equation solvers for extracting network parameters. A small gap region in the domain of analysis is identified as a two-terminal port, and the fields in the gap are linked to the lumped-circuit voltage/current definitions by enforcing the following conditions: 1) The line integrals of the electric field along straight paths in the gap are equal to the port voltage. 2) The current conducted into/out of the gap region is identical and equal in magnitude to the port current. The port model is implemented by modifying the traditional method-of-moments solution to use a novel divergence-conforming testing function at the gap as well as half-basis functions connected across the gap. Numerical results show the proposed model can outperform existing lumped-port models.