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Nexxim Simulator >
Nexxim Component Models >
Grounded Coplanar Waveguide Elements >
Coupled Lines, Asymmetric, Electrical Length, Field Solver

Coupled Lines, Asymmetric, Electrical Length, Field Solver

Netlist Form

An asymmetric coupled line, electrical length, field solver instance has the following netlist syntax:

Wxxx n1 n2 0 n3 n4 0
+ L='(E*3e8)/(360*F*SQRT(ER))' // Convert to physical length
+ N=2 FSmodel=modelname

.MATERIAL material METAL CONDUCTIVITY=conductivity
.MATERIAL dielectric DIELECTRIC ER=er LOSSTANGENT=losstangent
.SHAPE RECT1 RECTANGLE WIDTH=w1 HEIGHT=h
.SHAPE RECT2 RECTANGLE WIDTH=w2 HEIGHT=h
.SHAPE RECT3 RECTANGLE WIDTH='5*(w1+w2)' HEIGHT=h
.LAYERSTACK STACK1
+ LAYER=(material,h)
+ LAYER=(dielectric,dlayer)
.MODEL modelname W MODELTYPE=Fieldsolver
+ LAYERSTACK=STACK1
+ CONDUCTOR=(SHAPE=RECT3, ORIGIN=('-gap-5*(w1+w2)',dlayer+h)
+ MATERIAL=conductor, TYPE=REFERENCE)
+ CONDUCTOR=(SHAPE=RECT1, ORIGIN=(0,dlayer+h)
+ MATERIAL=conductor, TYPE=SIGNAL)
+ CONDUCTOR=(SHAPE=RECT2, ORIGIN=('w1+sep',dlayer+h)
+ MATERIAL=conductor, TYPE=SIGNAL)
+ CONDUCTOR=(SHAPE=RECT3, ORIGIN=('w1+sep+w2+gap', dlayer+h)
+ MATERIAL=conductor, TYPE=REFERENCE)

n1 and n3 are the names of the input nodes. n2 and n4 are the corresponding output nodes. The entry N=2 is required.

The entry FSmodel=modelname links the field solver coplanar waveguide instance to the model code.

**Asymmetric Coupled Line, Electrical Length, Field Solver**
**Instance Parameters**
Parameter	Description	Units	Default
E	Electrical length	Degree	45
F	Reference frequency for electrical length	Hertz	1e9
N	Number of lines (must be 2)	None	2
material	Conductor material	None	cond1
conductivity	Conductivity of conductor material		57.6e6
dielectric	Dielectric material	None	diel1
er	Dielectric constant		2.2
losstangent	Dielectric loss tangent		0
w1	Width of first conductor	Meter	1e-3
w2	Width of second conductor	Meter	1e-3
gap	Gap width between outer conductors and grounds	Meter	1e-3
sep	Spacing between conductors	Meter	1e-3

Note

The default values for the coupled line are the ones assigned when placing a component from the Ansoft Component library in a schematic. There are NO defaults for netlist designs; all values must be specified.

Netlist Example

W3 Port1 Port2 0 net_1911 net_2 0 N=2
+ L=’(45*3e8)/(360*1e9*SQRT(4.4)
+ FSmodel=GCPW1

.MATERIAL COPPER METAL CONDUCTIVITY=58000000
.MATERIAL dielectric1 DIELECTRIC ER=4.4 LOSSTANGENT=0.02
.SHAPE RECT1 RECTANGLE WIDTH=0.001 HEIGHT=0.002
.SHAPE RECT2 RECTANGLE WIDTH=0.002 HEIGHT=0.002
.SHAPE RECT3 RECTANGLE WIDTH='5*(.001+.002)' HEIGHT=0.002
.LAYERSTACK STACK1
+ LAYER=(COPPER,0.002)
+ LAYER=(dielectric1,0.010)
.MODEL GCPW1 W MODELTYPE=Fieldsolver
+ LAYERSTACK=STACK1
+ CONDUCTOR=(SHAPE=RECT3,
+ ORIGIN=('-.005-5*(.001+.002)',.010+.002)
+ MATERIAL=conductor, TYPE=REFERENCE)
+ CONDUCTOR=(SHAPE=RECT1, ORIGIN=(0,.010+.002)
+ MATERIAL=conductor, TYPE=SIGNAL)
+ CONDUCTOR=(SHAPE=RECT2, ORIGIN=('.001+.003',.010+.002)
+ MATERIAL=conductor, TYPE=SIGNAL)
+ CONDUCTOR=(SHAPE=RECT3,
+ ORIGIN=('.001+.003+.002+.005', .010+.002)
+ MATERIAL=conductor, TYPE=REFERENCE)

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