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Nexxim Simulator >
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Grounded Coplanar Waveguide Elements >
Grounded Coplanar Waveguide Substrate Model

Grounded Coplanar Waveguide Substrate Model

Defining a Grounded Coplanar Waveguide Model

To add a grounded coplanar waveguide substrate model to a new Nexxim design, you must define the substrate model. 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.

Grounded Coplanar Waveguide Substrate Model Netlist Format

The Grounded Coplanar Waveguide substrate model has the following netlist format:

.SUB substrate_name CPW ([H=val] [HU=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.

**Grounded 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
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

Grounded Coplanar Waveguide Substrate Model Netlist Example

.SUB GCPW1 GCPW(
+ H=0.001524 HU=0.003 Er=4.4 TAND=0.02
+ MET1=1.724137931034483 T1=2.5400e-005
+ RGH=0)

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