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Nexxim Simulator >
Nexxim Component Models >
Microstrip Elements >
Transmission Line, Field Solver

Transmission Line, Field Solver

Netlist Format

A field solver microstrip transmission line has the following netlist syntax:

Wxxx n1 0 n2 0 N=1 W=val L=val FSmodel=modelname

.MATERIAL conductor METAL CONDUCTIVITY=val
.MATERIAL dielectric DIELECTRIC ER=val LTAND=val
.SHAPE RECT1 RECTANGLE WIDTH=w HEIGHT=t1 // Conductors
.LAYERSTACK layerstack
+ LAYER=(conductor, t2) // Ground plane
+ LAYER=(dielectric, h)
+ LAYER=(AIR, hu)
.MODEL modelname W MODELTYPE=Fieldsolver
+ LAYERSTACK=layerstack
+ CONDUCTOR=(SHAPE=RECT1, ORIGIN=(0, 't2 + h')

n1, and n2 are the names of the input and output nodes. The entry N=1 shows that this is a single transmission line. The names for the modelname, conductor, dielectric, and layerstack are supplied by the user.

The entry FSmodel=modelname identifies the field solver microstrip W-model.

**Transmission Line, Field Solver Instance Parameters**
Parameter	Description	Units	Default
W	Width of conductor	Meter	0.001
L	Physical length	Meter	0.01
N	Number of lines for W-element (must be 1 for transmission line)	None	1
H	Thickness of dielectric layer	Meter	1e-3
HU	Thickness of air layer	Meter	B/2
T1	Thickness of conductors	Meter	0.001
T2	Thickness of ground planes	Meter	0.001
CONDUCTIVITY	Conductivity of conductor material		57.6e6
ER	Dielectric constant		2.2
TAND	Dielectric loss tangent		0

Note

The default values for the transmission 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 0 Port2 0 N=1 W-0.0001 L=0.002 FSmodel=MS1

.MATERIAL cond1 METAL CONDUCTIVITY=5.8e7
.MATERIAL diel1 DIELECTRIC ER=4.4 LOSSTANGENT=0.02
.SHAPE RECT1 RECTANGLE WIDTH=.005 // Conductor width W
+ HEIGHT=.001 // Conductor thichness T1
.LAYERSTACK microstrip
+ LAYER=(cond1, .001) // Bottom ground, T2
+ LAYER=(diel1, .01) // Dielectric, H
+ LAYER=(AIR, .002) // Air layer, HU
.MODEL MS1 W MODELTYPE=Fieldsolver
+ LAYERSTACK=microstrip
+ CONDUCTOR=(SHAPE=RECT1, + ORIGIN=(0, '.001 + .01'), // T2 + H
+ MATERIAL=cond1, TYPE=SIGNAL)

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