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

Rectangular Waveguide Substrate Model

Defining a Rectangular Waveguide Model

To add a rectangular waveguide 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.

Rectangular Waveguide Substrate Model Netlist Format

The rectangular waveguide substrate model has the following netlist format:

.SUB substrate_name RWG ( [ER=val] [TAND=val] [UR=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 RWG is required to identify the Slotline substrate type. The RWG identifier must immediately follow the substrate_name.

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

**Rectangualr Waveguide Substrate Parameters**
Parameter	Description	Unit	Default
ER	Dielectric constant of substrate	None	4.5
UR	Permeability	None	1.0
TAND	Dielectric loss tangent	None	0.0
T1, T2, T3	Thickness of metal layer 1, 2, 3	Meter	0.0
MET1, MET2, MET3	Resistivity of metal layer 1, 2, 3	mOhm-cm	0.0
RGH	RMS surface roughness	Meter	0.0

Rectangular WaveguideSubstrate Model Netlist Example

.SUB RWG1 RWG(
+ UR=0.01 ER=4.4 TAND=0.02
+ MET1=1.724137931034483 T1=2.5400e-005
+ RGH=0)

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