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Nexxim Simulator >
Nexxim Component Models >
Coplanar Waveguide Elements >
Slot Gap

Slot Gap

Netlist Format

An instance of a coplanar waveguide slot gap has the following netlist syntax:

ACPWSGAP:xxxx n1 n2 COMPONENT=cpw_slot_gap W=val G=val D=val SUBSTRATE=substrate_name

n1 and n2 are the names of the nodes attached to the slot gap. The entry COMPONENT=cpw_slot_gap identifies the element.

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

**Coplanar Waveguide Slot Gap Instance Parameters**
Parameter	Description	Units	Default
W	Width of center conductor	Meter	1.0e-3
G	Slot width	Meter	1.0e-3
D	Separation distance	Meter	1.0e-3

Netlist Example

ACPWSGAP:5 Port1 Port2 W=1.1mm G=0.75mm D=1.5mm COMPONENT=cpw_slot_gap SUBSTRATE=CPW1

where CPW1, the selected layout technology or substrate type, has a definition such as:

.SUB CPW1 CPW(
+ H=0.001524 Er=4.4 TAND=0.02 HU=2.54E-4 HL=2.54e-4
+ MET1=1.724137931034483 T1=2.54e-5 RGH=0)

Notes

1. Quasi-Static behavior is assumed in the analysis. This assumption is valid for most CPW applications in a wide frequency range.

2. Only the symmetrical case is considered.

3. The model computes the equivalent T-network inductances.

References

[1] W. Getsinger, “Circuit Duals of Planar Transmission Media,” 1983 IEEE MTT-S Digest, pp. 154-156.

[2] J. Everard, and K. Cheng, ``High performance Direct Coupled Bandpass Filters on Coplanar Waveguide, '' IEEE Trans. on MTT, Sep. 1993, pp. 1568-1573.

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