There is no limitation on where theports are defined. The Extension de-embedding schemes allow fast and accurateparameter extraction. While the Waves de-embedding schemes use the pureelectromagnetic wave concepts and yield the most accurate results. TheLocalized de-embedding schemes allow parameter extraction in highly packedstructures. Modeling structures with finite ground planesand differential feed structures.
Most field solvers assume infinite ground planes in solving circuitand antenna problems.
In many microwave and RF applications, you may notbe able to find a large ground plane where you can define 0 potential. Therefore, infinite ground plane assumption is not applicable. IE3D isable to model structures with finite ground planes. The key to modelingfinite ground planes is the differential feed. Most of the de-embeddingschemes in IE3D can be used for differential feed.