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Nexxim Simulator >
Nexxim Component Models >
Stripline Elements >
Tapered Line, W Specified, Impedance Taper

Tapered Line, W Specified, Impedance Taper

Netlist Format

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

Axxx n1 n2 n3 n4 W1=val W2=val P=val TAPER=LinImp|ExpImp
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 Stripline substrate model name selected for the design (see Selecting a Stripline Substrate). See the Stripline (SL) Substrate for information on this substrate type.

**Tapered Line, W Specified, Impedance 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: LinImp—Linear Impedance ExpImp—Exponential Impedance	None	ExpImp

Netlist Example

A2 Port1 Port2 W1=0.001 W2=0.003 P=0.01 TAPER=ExpImp
+ COMPONENT=taper_width_specified SUBSTRATE=SL1

where SL1, the selected layout technology or substrate type, has a definition such as:

.SUB SL1 SL( B=0.001524 Er=4.40000000000000
+ TAND=0.0200000000000000 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 impedance tapered line element does not have a physical footprint in Designer.

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

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