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Two-Layer Stripline Substrate Definition: SSUBL

Symbol

Topology

Parameters

Name Description Unit Type Default
Er1 Top layer relative dielectric constant   Er[1]
Er2 Bottom layer relative dielectric constant   Er[1]
Tand1 Loss tangent of the top layer   0
Tand2 Loss tangent of the bottom layer   0
H1 Top layer thickness Length H[1]
H2 Bottom layer thickness Length H[1]
T Conductor thickness Length T[1]
Rho Metal bulk resistivity relative to gold   0[1]
Er1Nom[2] Nominal relative dielectric constant of layer #1   Er[1]
Er2Nom[3] Nominal relative dielectric constant of layer #2   Er[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.

[2] See “X-model Tables Shipped with the AWR Design Environment” for a list of available X-model tables.

[3] See “X-model Tables Shipped with the AWR Design Environment” for a list of available X-model tables.

Implementation Details

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

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

H1, H2, and T are the cross-sectional dimensional variables entered in default length units. Conductor thickness T may be zero, positive, or negative. A negative thickness means that the conductor is recessed into the bottom dielectric layer

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 SSUBL. The stripline elements have a SSUBL parameter that indicates which SSUBL element to use.

This substrate is used in models S1LIN, SxCLIN (x=2..16), SNCLIN, and STEEX.

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

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.

Elements Used with SSUBL

COUPLED LINES LINES JUNCTIONS
SxCLIN (x=3..16) S1LIN STEEX
S2CLIN    
SNCLIN    

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