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Unbalanced Stripline Substrate Definition: SSUB2



SSUB2 provides an unbalanced substrate definition used for stripline schematic elements. The substrate is backed by an infinite ground plane and a conducting cover is present over the substrate. An unbalanced substrate is comprised of two stacked substrates made of the same material but having different height. A strip conductor is sandwiched between these substrates.


Name Description Unit Type Default
Er Relative dielectric constant   Er[1]
H1 Substrate No1 thickness Length H[1]
H2 Substrate No2 thickness Length H[1]
T Conductor thickness Length T[1]
Rho Metal bulk resistivity normalized to copper   1
Tand Loss tangent of dielectric   0
ErNom Nominal relative dielectric constant   Er[1]
Name Substrate name   SSUB1[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 “Using Elements With Model Blocks” for details.

Parameter Details

Er. Relative dielectric constant of the homogeneous dielectric that makes all substrate.

Rho is the bulk resistivity of conductor metal normalized to copper (to 1.7 x 10 -8 Ω*m)

Actual metal bulk resistivity = Rho*1.7 x 10-8 Ω*m.

H1. Thickness of the upper substrate (No 1)

H2.Thickness of the lower substrate (No 2)

ErNom. 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.

Implementation Details

Note that you can also add this substrate to the Global Definitions window and then reference the material from any schematic.


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

SSUB2 must be present on the schematics that contain elements using SSUB2.

Elements Used with SSUB2


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