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Three Layered Stripline Substrate Definition: SSUBT




Name Description Unit Type Default
Er1 Top layer relative dielectric constant   Er[1]
Er2 Middle layer relative dielectric constant   Er[1]
Er3 Bottom layer relative dielectric constant   Er[1]
Tand1 Loss tangent of the top layer   0
Tand2 Loss tangent of the middle layer   0
Tand3 Loss tangent of the bottom layer   0
H1 Top layer thickness Length H[1]
H2 Middle layer thickness Length H[1]
H3 Bottom layer thickness Length H[1]
T Conductor thickness Length T[1]
Rho Metal bulk resistivity relative to gold   Rho[1]
Name Substrate name Text SUB

[1] User-modifiable default. Modify by editing under $DEFAULT_VALUES in the default.lpf file in the root installation directory.

Implementation Details

Er1, Er2, and Er3 are the permittivities of the substrate materials relative to free space ε0 = 8.854 x 10-12 F/M

Tand1, Tand2, and Tand3 are the dielectric loss tangent of the substrate material: Tand = εr″/εr′ where εr = εr′ -jεr

H1, H2, H3, and T are the cross-sectional dimensional variables entered in default length units.

In a schematic that contains stripline elements, at least one instance of this element must exist. The Name parameter provides a unique identifier for each instance of SSUBT. The stripline elements have a SSUBT parameter that indicates which SSUBT element to use.

This substrate is used in SBCPL (2 Broadside Coupled Striplines) model.

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.

Element Used with SSUBT


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