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Four Layer Microstrip Substrate Definition: MSUB4




Name Description Unit Type Default
Er1 First (top) layer relative dielectric constant   Er[1]
Er2 Second layer relative dielectric constant   Er[1]
Er3 Third layer relative dielectric constant   Er[1]
Er4 Fourth layer relative dielectric constant   Er[1]
Tand1 Loss tangent of the first (top) layer   0
Tand2 Loss tangent of the second layer   0
Tand3 Loss tangent of the third layer   0
Tand4 Loss tangent of fourth (bottom) layer   0
H1 First (top) layer thickness Length H[1]
H2 Second layer thickness Length H[1]
H3 Third layer thickness Length H[1]
H4 Fourth (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 MSUB4

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

Implementation Details

Er1, Er2, Er3, Er4 are the permittivities of the substrate materials relative to free space ε0 = 8.85 x 10-12 F/M. Tand1, Tand2, Tand3, Tand4 are the dielectric loss tangent of the substrate material: Tand = εr″/εr′ where εr = εr′ -jεr

Rho is the bulk resistivity of conductor metal normalized to gold (to 2.44 x 10 -8 Ω*m)

Actual metal bulk resistivity = Rho * 2.44 x 10 -8 Ω*m.

H1, H2, H3, H4, and T are the cross-sectional dimensional variables entered in default length units.

In a schematic that contains microstrip elements, at least one instance of this element must exist. The Name parameter provides a unique identifier for each instance of MSUB4. The microstrip elements have an MSUB4 parameter that indicates which MSUB4 element to use.

This substrate is used in MEMLIN (Embedded Microstrip Line) and MEM2LIN (2 Embedded Coupled Microstrip Lines) models.

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.

Elements Used with MSUB4


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