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   Tapered Line, W Specified, with Reference       

Tapered Line, W Specified, with Reference

 

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Netlist Format

An instance of a tapered line, W specified, with reference has the following netlist syntax:

Axxx n1 n2 n3 n4 W1=val W2=val P=val
TAPER=LinImp|ExpImp|LinWidth|ExpWidth
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, with reference node.

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, with Reference,
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:

LinWidth—Linear Width

ExpWidth—Exponential Width

LinImp—Linear Impedance

ExpImp—Exponential Impedance

None

LinWidth

Netlist Example

A2 Port1 Port2 W1=0.001 W2=0.003 P=0.01 TAPER=ExpWidth
+ COMPONENT=TAPER_WIDTH_SPECIFIED 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 such that n1 and associated width W1 are at the wide end of the taper.

2. [All substrates] The Tapered Line with Reference syntax is supported in netlists only. See the next three topics for the tapered line elements available in schematics.

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



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