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Reference Plane Shifting and De-embedding

At a port, the term de-embedding refers to the estimation and elimination of parasitic reactance due to the physical end of a transmission line. Reference-plane shifting refers to adjusting the phases of circuit parameters such as S-matrix or impedance matrix entries consistent with changing the physical length of the transmission line. Both de-embedding and reference-plane shifting are typically done as a post-processing step on a full simulation of a structure.

Since wave ports are effectively an infinite extension of the port cross-section, they are naturally free of parasitics. The reference plane at a wave port can be shifted, if desired, using the Reference Plane Shift in the port properties. Using a positive value will move the reference plane into the structure, and a negative value will move the reference plane out of the structure.

De-embedding and reference-plane shifting are not supported for lumped ports in RF3p, so comparisons with solvers that support port de-embedding should be made with those features turned off. Wave ports are intrinsically de-embedded, so in a comparison between RF3p using wave ports and another software using lumped ports, de-embedding should be turned on in the comparison software.

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