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

Stripline Substrate Model

Defining a Stripline Model

To add a stripline substrate model to a new Nexxim design, select one of the SL substrate types from the Choose Layout Technology window that appears when you select Insert Nexxim Circuit Design from the Project pulldown in Designer. A substrate that is added from this window has a default substrate name and metallization parameters.

To add a new substrate 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.

Stripline Substrate Model Netlist Format

The Stripline substrate model has the following netlist format:

.SUB substrate_name SL ([B=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 SL is required to identify the Stripline substrate type. The SL identifier must immediately follow the substrate_name.

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

**Stripline Substrate Parameters**
Parameter	Description	Unit	Default
B	Spacing between ground planes, B > 0	Meter	1e-3
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 SL1 SL( B=0.001524 Er=4.40000000000000
+ TAND=0.0200000000000000 MET1=1.72413793103448
+ T1=1.7145e-005 RGH=0mil)

Notes

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

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