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Open Stub, Electrical Length with Reference

Open Stub, Electrical Length with Reference

Netlist Format

An instance of an open stub, electrical length with reference has the following netlist syntax:

Axxx n1 n2 W=val E=val F=val COMPONENT=open_stub_e SUBSTRATE=substrate_name

n1 is the name of the node attached to the open stub. n2 is the name of the reference node. The entry COMPONENT=open_stub_e identifies the element as an open stub, electrical length, with or without a 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.

**Open Stub, Electrical Length with Reference, Instance Parameters**
Parameter	Description	Units	Default
W	Line width	Meter	1e-3
E	Electrical length	Degree	45
F	Reference frequency for E	Hz	1e9

Netlist Example

A44 Port1 Port2 W=1.0e-3 E=45 F=1.0e9
+ COMPONENT=open_stub_e 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] The open stub, electrical length model is equivalent to a transmission line model followed by an open model. This is also true in the case of negative length specifications, which are used for deembedding purposes. Note that in the latter case, the open stub model is equivalent to the transmission line model with a negative length terminated by an open.

2. [Microstrip] This model includes radiation effects if a cover height is not supplied (i.e., open structure.)

3. [Microstrip] The following limits apply (H is the thickness of the dielectric):
0.01 £ W/H £ 100

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