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   Transmission Line, Physical Length with Reference       

Transmission Line, Physical Length with Reference


 

Netlist Format

An instance of a transmission line with physical length and reference nodes has the following netlist syntax:

Axxx n1 n2 n3 n4 [W=val] [P=val] COMPONENT=TRL SUBSTRATE=substrate_name

n1, n2, n3, and n4 are the names of the nodes attached to the transmission line. The entry COMPONENT=TRL identifies the element as a transmission line with physical length.

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.

 


Transmission Line with Physical Length and Reference Nodes, Instance Parameters

Parameter

Description

Units

Default

P

Physical length

Meter

1e-2

W

Conductor width

Meter

1e-3

Netlist Example

A5 Port1 Port2 0 0 W=0.001 P=0.01
+ COMPONENT=TRL 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 substrate definition should satisfy the following conditions:
0.01 £ W/H £ 10, ER < 18, T £ W, and T £ H/2.



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