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

Coupled Lines, Asymmetric, Physical Length, Field Solver

 

 

 

Netlist Form

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

Wxxx n1 n2 0 n3 n4 0 [L=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=(dielectric,dlayer)
.MODEL modelname W MODELTYPE=Fieldsolver
+ LAYERSTACK=STACK1
+ CONDUCTOR=(SHAPE=RECT3, ORIGIN=('-gap-5*(w1+w2)',dlayer)
+ MATERIAL=conductor, TYPE=REFERENCE)
+ CONDUCTOR=(SHAPE=RECT1, ORIGIN=(0,dlayer)
+ MATERIAL=conductor, TYPE=SIGNAL)
+ CONDUCTOR=(SHAPE=RECT2, ORIGIN=('w1+sep',dlayer)
+ MATERIAL=conductor, TYPE=SIGNAL)
+ CONDUCTOR=(SHAPE=RECT3, ORIGIN=('w1+sep+w2+gap', dlayer)
+ 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 identifies the field solver coplanar waveguide model.

 


Asymmetric Coupled Line, Physical Length, Field Solver
Instance Parameters

Parameter

Description

Units

Default

L

Physical length

Meter

1e-3

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=0.002 FSmodel=CPW1

.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=(dielectric1,0.010)
.MODEL CPW1 W MODELTYPE=Fieldsolver
+ LAYERSTACK=STACK1
+ CONDUCTOR=(SHAPE=RECT3, ORIGIN=('-.005-5*(.001+.002)',.010)
+ MATERIAL=conductor, TYPE=REFERENCE)
+ CONDUCTOR=(SHAPE=RECT1, ORIGIN=(0,.010)
+ MATERIAL=conductor, TYPE=SIGNAL)
+ CONDUCTOR=(SHAPE=RECT2, ORIGIN=('.001+.003',.010)
+ MATERIAL=conductor, TYPE=SIGNAL)
+ CONDUCTOR=(SHAPE=RECT3, ORIGIN=('.001+.003+.002+.005', .010)
+ MATERIAL=conductor, TYPE=REFERENCE)

 




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