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Nexxim Simulator >
Nexxim Component Models >
Offset Stripline Elements >
Offset Stripline Substrate Model

Offset Stripline Substrate Model

Defining an Offset Stripline Model

To add an offset stripline substrate model to a new Nexxim design, you must add the definition to the set of substrate models. .

To add a new substrate definition to an existing design, expand the Project icon, then the Design icon. Right click on the Data icon, and select Add Substrate Definition. The Substrate Definition window appears. Add the substrate name and parameters as desired, then click OK. A substrate added in this manner requires you to specify the metallization parameters explicitly.

To edit the definition of a substrate, expand the Project icon, then the Design icon, then the Data icon. Click on the icon for the substrate you wish to edit. The Substrate Definition window appears. Add or modify the substrate parameters as desired, then click OK.

Offset Stripline Substrate Model Netlist Format

The Offset Stripline substrate model has the following netlist format:

.SUB substrate_name OSL ([B=val] BL=val [ER=val] [TAND=val]

[MET1=val] [T1=val] [MET2=val] [T2=val] [MET3=val] [T3=val]

[RGH=val])

The substrate_name is the name for the substrate type used in distributed elements that refer to this substrate definition. The entry OSL is required to identify the Offset Stripline substrate type. The OSL identifier must immediately follow the substrate_name.

Inside the parentheses, the labeled parameters may be entered in any order.

**Offset Stripline Substrate Parameters**
Parameter	Description	Unit	Default
B	Spacing between ground planes, B > 0	Meter	1e-3
BL	Spacing between stripline and lower ground plane	Meter
ER	Dielectric constant of substrate, 1 £ ER £ 128	None	4.5
MET1, MET2, MET3	Resistivity of metal layer 1, 2, 3	mOhm-cm	0.0
RGH	RMS surface roughness	Meter	0.0
T1, T2, T3	Thickness of metal layer 1, 2, 3	Meter	0.0
TAND	Dielectric loss tangent, [0,0.1]	None	0.0

Stripline Substrate Model Netlist Example

.SUB OSL1 OSL(
+ B=0.001524 Er=4.4 TAND=0.02 BL=2.5400e-004
+ MET1=1.724137931034483 T1=2.5400e-005
+ RGH=0)

Notes

1. Surface roughness in the substrate definition is not supported in the MCPL implementation.

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