Go to www.awrcorp.com
Back to search page Click to download printable version of this guide.

Suspended Microstrip Substrate Definition: MPSUB

Symbol

Summary

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.

Parameters

Name Description Unit Type Default
Er Substrate relative dielectric constant   Er[1]
Tand Substrate loss tangent   0
H1 Substrate height Length H[1]
H2 Substrate elevation over the ground Length H[1]
T Conductor thickness Length T[1]
Rho Metal bulk resistivity relative to gold   1
ErNom Nominal relative dielectric constant   Er[1]
Name Substrate name Text MPSUB1[2]

[1] User-modifiable default. Modify by editing under $DEFAULT_VALUES in the default.lpf file in the root installation directory. See the AWR Microwave Office Layout Guide for details.

[2] Modify only if a schematic contains multiple substrates. See “Using Elements With Model Blocks” for details.

Implementation Details

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.

Layout

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.

Recommendations for Use

MPSUB must be present on the schematics that contain elements using MPSUB.

Elements Used with MPSUB

BENDS COUPLED LINES JUNCTIONS
MSBND90X MS2CLINX MSCROSSX
  MSBCPLX MSSTEPX
  MI2CLIN MSTEEX
  MS2CLIN  
  MSBCPL  

LINES OTHER
MS1LIN MSOPENX
MI1LIN  
MS1LINX  

Legal and Trademark Notice