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Microstrip Elements >
Open Stub, Physical Length

Open Stub, Physical Length

Netlist Form

An instance of an open stub with physical length has the following netlist syntax:

Axxx n1 W=val P=val COMPONENT=open_stub SUBSTRATE=substrate_name

n1 is the name of the node attached to the open stub. The entry COMPONENT=open_stub identifies the element as an open stub 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.

**Open Stub with Physical Length, Instance Parameters**
Parameter	Description	Units	Default
W	Line width	Meter	1e-3
P	Physical length	Meter	10e-3

Netlist Example

A44 Port1 W=0.001 P=10e-3 COMPONENT=open_stub 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 physical model using physical length includes the open end length correction.

2. [All substrates] The open stub 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.

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

4. [Microstrip] The following limits apply: .01 £ W/H £ 100, where H is the thickness of the dielectric

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