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Radial Stub, Shunt, Inner Radius Specified

Radial Stub, Shunt, Inner Radius Specified

Netlist Format

An instance of a shunt radial stub with inner radius specified has the following netlist syntax:

Axxx n1 n2 A=val RI=val RL=val W=val COMPONENT=radial_stub_radius_shunt SUBSTRATE=substrate_name

n1 and n2 are the names of the nodes attached to the radial stub. The entry COMPONENT=radial_stub_radius_shunt identifies the element as a shunt radial stub with inner radius specified.

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.

**Radial Stub, Shunt, Radius Specified, Instance Parameters**
Parameter	Description	Units	Default
A	Aperture angle	Degree	60
RI	Inner radius	Meter	0.2e-3
RL	Outer radius	Meter	10.0e-3
W	Feedline width	Meter	0.5e-3

Netlist Example

A44 Port1 Port2 A=65 RI=0.1e-3 RL=9e-3 W=0.8e-3
+ COMPONENT=radial_stub_radius_shunt 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] Valid for H/l_g<< 1, where H is the substrate thickness defined in the corresponding .SUB statement, and l_g is the wavelength in the substrate.

2. Inline configurations of the Radial Stub model include coupling to the main line. Implied MSTEEE, MSTEEC, or MSCROSS junctions are included in this model.

3. The stub is open at the outer radius RL.

4. Conductor and dielectric losses are included if the metallization or the surface resistivity are specified with the substrate data.

References

1. B. A. Syrett, “A Broad-Band Element for Microstrip Bias or Tuning Circuits,” IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-28, No. 8, Aug. 1980, pp. 925-927.

2. F. Gianinni, R. Sorrentino, “Planar Circuit Analysis of Microstrip Radial Stubs,” IEEE MTT-32, No. 12, Dec. 1984, pp. 1652-1655.

3. F. Gianinni, “CAD-Oriented Lossy Models for Radial Stubs,” IEEE MTT-36, No. 2, Feb. 1988, pp. 305-313.

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