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Nexxim Simulator >
Nexxim Component Models >
Grounded Coplanar Waveguide Elements >
Open Stub, Physical Length

Open Stub, Physical Length

Netlist Format

An instance of a grounded coplanar waveguide open stub, physical length has the following netlist syntax:

Axxx n1 [W=val] [G=val] [P=val] [GAP=val]
COMPONENT=gcpw_open_stub_physical SUBSTRATE=substrate_name

n1 is the name of the node attached to the open stub. The entry COMPONENT=gcpw_open_stub_physical identifies the element as a grounded coplanar waveguide open stub, physical length.

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 Open Stub, Physical Length Instance Parameters**
Parameter	Description	Units	Default
W	Width of center conductor	Meter	1.0e-3
G	Slot gap width	Meter	1.0e-3
P	Physical length	Meter	5.0e-3
GAP	Gap width at end of CPW line	Meter	1.0e-3

Netlist Example

A5 Port1 W=0.75e-3 G=1.1e-3 P=2.5e-3 GAP=1.75e-3 COMPONENT=gcpw_open_stub_physical 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 substrate thickness must be larger than (W + 2*G), so that the effect of the lower ground plane is negligible.

2. The physical model using physical length includes the open end length correction.

3. The GCPWOST model is equivalent to a transmission line followed by an open model. This is also true in the case of negative length specifications which are used for de-embedding.

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