MPSUB provides a suspended substrate definition used for microstrip schematic elements. Suspended substrate is elevated over the infinite ground plate; no cover is present over the substrate. Substrate is backed by an infinite ground plane and separated from it by an air layer.
|Er||Substrate relative dielectric constant||Er|
|Tand||Substrate loss tangent||0|
|H2||Substrate elevation over the ground||Length||H|
|Rho||Metal bulk resistivity relative to gold||1|
|ErNom||Nominal relative dielectric constant||Er|
Note that you can also add this substrate to the Global Definitions window and then reference the material from any schematic.
ErNom represents the nominal dielectric constant of the substrate relative to free space and is used only by the EM Based models where all EM data is collected at Er_Nom and a variational approach is used to estimate the performance for small variations in Er about Er_Nom. See “How to Properly Set Up Substrate Parameters for X-models” for more details.
This element does not have an assigned layout cell. You can assign artwork cells to any element. See “Assigning Artwork Cells to Layout of Schematic Elements” for details.