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Nexxim Simulator >
Nexxim Component Models >
Microstrip Elements >
Step

Step

Netlist Format

A step instance has the following netlist format:

Axxx n1 n2 W1=val W2=val D=val [NSUM=val]
COMPONENT=step SUBSTRATE=substrate_name

n1 and n2 are the names of the nodes attached to the step. The entry COMPONENT=step identifies the element as a step. The entry SUBSTRATE=substrate_name identifies the microstrip substrate model name selected for the design (see Selecting a Microstrip Substrate). See the Microstrip (MS) Substrate for information on this substrate type.

**Step Instance Parameters**
Parameter	Description	Unit	Default
W1	Width of line connected to node n1	Meter	1e-3
W2	Width of line connected to node n2	Meter	1e-3
D	Offset between lines	Meter	Calculated

Netlist Example

A23 Port1 Port2 W1=1e-3 W2=2e-3 D=0.5e-3 COMPONENT=STEP SUBSTRATE=FR4

where FR4, the selected layout technology or substrate type, has a definition such as:

.SUB FR4 MS( H=7.6200e-004 Er=4.4 TAND=0.02 TANM=0
+ MSat=0 MRem=0 HU=0.00508 MET1=1.72413793103448
+ T1=1.7145e-005 RGH=0mil)

Notes

1. [Microstrip] The model is valid for frequencies much less than the cutoff frequency of the second higher order mode of the planar waveguide model of the wide microstrip.

2. [All] If offset D parameter not specified, it is calculated as (|W1-W2|)/2.

3. [Microstrip] Radiation loss is calculated if HU is not specified in the .SUB statement.

References

1. R. Hoffmann, Handbook of Microwave Integrated Circuits, Artech House, 1987.

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