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Nexxim Simulator >
Nexxim Component Models >
Grounded Coplanar Waveguide Elements >
Step

Step

Netlist Format

An instance of a grounded coplanar waveguide step has the following netlist syntax:

Axxx n1 n2 [W1=val] [P=val]
COMPONENT=gcpwstep SUBSTRATE=substrate_name

n1 and n2 are the names of the nodes attached to the step. The entry COMPONENT=gcpwstep identifies the element as a grounded coplanar waveguide step.

The SUBSTRATE=substrate_name is the grounded coplanar waveguide substrate model name selected for the design (see Selecting a Grounded Coplanar Waveguide Substrate for details).

**Grounded Coplanar Waveguide Step Instance Parameters**
Parameter	Description	Units	Default
W1	Conductor width of line connected to node 1	Meter	1.5e-3
G1	Slot width of line connected to node 1	Meter	1e-3
W2	Conductor width of line connected to node 2	Meter	1e-3
G2	Gap width of line connected to node 2	Meter	1.5e-3

Netlist Example

A5 Port1 Port2 W1=0.75e-3 G1=1.1e-3 W2=0.5e-3 G2=1.3e-3 COMPONENT=gcpwstep SUBSTRATE=GCPW1

where GCPW1, the selected layout technology or substrate type, has a definition such as:

.SUB GCPW1 GCPW(
+ H=0.001524 Er=4.4 TAND=0.02 HU=2.54E-4
+ MET1=1.724137931034483 T1=2.54e-5 RGH=0)

Notes

1. The model computes the equivalent T-network of the GCPW step, which consists of two series inductors and a shunt capacitor.

2. For accurate results, the substrate definition should specify:
H > W1 + 2´G1
H > W2 + 2´G2
0.1 < k1 < 0.9, where k1 = W1/(W1 + 2´G1)
0.1 < k2 < 0.9, where k2 = W2/(W2 + 2´G2)

3. When G2>G1, W1>W2. When G2<G1, W1<W2.

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