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

Suspended Stripline Substrates Definition: SPSUB

Symbol

Summary

SPSUB provides a suspended substrate definition used for stripline schematic elements. Suspended substrate is elevated over the infinite ground plate; metallic cover is located over the substrate. Substrate is backed by an infinite ground plane and separated from it by an air layer. All layers may have arbitrary height.

Parameters

Name Description Unit Type Default
Er Substrate relative dielectric constant   Er[1]
Tand Substrate loss tangent   0
H1 Cover height over the substrate Length H[2]
H2 Substrate height Length H[2]
H3 Substrate elevation over the ground Length H[2]
T Conductor thickness Length T[2]
Rho Metal bulk resistivity relative to gold   1
ErNom Nominal relative dielectric constant   Er[1]
Name Substrate name Text SPUB1[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 the schematic contains multiple substrates. See the “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 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

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

Elements Used with SPSUB

BENDS COUPLED LINES JUNCTIONS
SSBND90X SS2CLINX SSCROSSX
  SSBCPLX SSSTEPX
  SS2CLIN SSTEEX
  SI2CLIN  

LINES OTHER
SS1LIN SSOPENX
SS1LINX  
SI1LIN  

Legal and Trademark Notice