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Nexxim Simulator >
Nexxim Component Models >
Coplanar Waveguide Elements >
Coplanar Waveguide Substrate Model

Coplanar Waveguide Substrate Model

Defining a Coplanar Waveguide Substrate

To add a new coplanar waveguide 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.

To edit the definition of an existing 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.

Coplanar Waveguide Substrate Model Netlist Format

The Coplanar Waveguide substrate model has the following netlist format:

.SUB substrate_name CPW ([H=val] [HU=val] [HL=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 CPW is required to identify the Coplanar Waveguide substrate type. The CPW identifier must immediately follow the substrate_name.

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

**Coplanar Waveguide Substrate Parameters**
Parameter	Description	Unit	Default
H	Thickness of dielectric	Meter	1e-3
HU	Spacing between top of dielectric and upper cover	Meter	0.0
HL	Spacing between bottom of dielectric and lower cover	Meter	0.0
ER	Dielectric constant of substrate, 1 £ ER £ 128	None	4.5
TAND	Dielectric loss tangent, [0,0.1]	None	0.0
MET1, MET2, MET3	Resistivity of metal layer 1, 2, 3	mOhm-cm	0.0
T1, T2, T3	Thickness of metal layer 1, 2, 3	Meter	0.0
RGH	RMS surface roughness	Meter	0.0

Coplanar Waveguide Substrate Model Netlist Example

.SUB CPW1 CPW(
+ H=0.001524 HU=0.003 HL=0.004 Er=4.4 TAND=0.02
+ MET1=1.724137931034483 T1=2.5400e-005
+ RGH=0)

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