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Nexxim Simulator >
Nexxim Component Models >
Suspended Stripline Elements >
Suspended Stripline (SS) Substrate Model

Suspended Stripline (SS) Substrate Model

Defining a Suspended Stripline Model

To add a suspended 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 Add Model 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.

Suspended Stripline Substrate Model Netlist Format

The Ssupended Stripline substrate model has the following netlist format:

.SUB substrate_name SS ( [ER=val] [TAND=val]
+ [H=val] [HU=val] [HL=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 SS is required to identify the Suspended Stripline substrate type. The SS identifier must immediately follow the substrate_name.

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

**Ssupended Stripline Substrate Parameters**
Parameter	Description	Unit	Default
ER	Dielectric constant of substrate, 1 £ ER £ 128	None	4.5
H	Dielectric height	Meter	1e-3
HU	Height of upper air layer	Meter	1e-3
HL	Height of lower air layer	Meter	1e-3
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

Suspended Stripline Substrate Model Netlist Example

.SUB SS1 SS (
+Er=4.2 H=0.5e-3 HU=2.54e-003
+ MET1=1.7241 T1=2.54e-005
+ RGH=0)

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