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Nexxim Simulator >
Nexxim Component Models >
Microstrip Elements >
Tapered Line, W Specified, Linear Width Taper

Tapered Line, W Specified, Linear Width Taper

Netlist Format

An instance of a tapered line, W specified, linear width taper has the following netlist syntax:

Axxx n1 n2 n3 n4 W1=val W2=val P=val TAPER=LinWidth COMPONENT=taper_width_specified SUBSTRATE=substrate_name

n1 and n2 are the names of the nodes attached to the tapered line, n3 and n4 are the reference nodes. The entry COMPONENT=taper_width_specified identifies the element as a tapered line, W specified.

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.

**Tapered Line, W Specified, Linear Width Taper,**
**Instance Parameters**
Parameter	Description	Units	Default
P	Physical length	Meter	1e-2
W1	Width of line at node 1	Meter	1e-3
W2	Width of line at node 2	Meter	1e-3
TAPER	Taper type: Must be LinWidth—Linear Width	None	LinWidth

Netlist Example

A2 Port1 Port2 W1=0.001 W2=0.003 P=0.01 TAPER=LinWidth
+ COMPONENT=taper_width_specified SUBSTRATE=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. [All substrates] Node numbers can be reversed, so that n1 and associated width W1 are at the wide end of the taper.

2. [All substrates] The Nexxim linear width tapered line element has a physical footprint in Designer.

3. [Microstrip] The substrate definition should satisfy the following conditions:
0.01 £ W/H £ 100, max(W1,W2) £ 0.5l_g, where l_g is the guide wavelength.

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