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Nexxim Simulator >
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Microstrip Elements >
Bend, Radial

Bend, Radial

Netlist Form

Axxxx n1 n2 W1=val R=val [ANG=val]
COMPONENT=radial_bend SUBSTRATE=substrate_name

n1 and n2 are the names of the nodes attached to the radial bend. The entry COMPONENT=radial_bend identifies the element as a radial bend. 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 Bend Instance Parameters**
Parameter	Description	Unit	Default
W	Width of line	Meter	0.001
R	Inner radius of bend	Meter	1e-20
ANG	Angle of bend	Degree	90

Netlist Example

A23 Port1 Port2 W=1e-3 R=1e-6 ANG=75
+ COMPONENT=radial_bend 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] This element corresponds to the case where the outer corner of the right-angle bend is mitered at an angle, such that the edges of the cut are on the intersection of the reference planes and the outer edges of the bend. In the case W1=W2, the angle of the cut is 45° and the miter ratio is 0.5.

2. [All substrates] Reference planes coincide with the inside vertex of the corner.

3. [Microstrip] Radiation loss is included if cover is not specified in the substrate definition.

References

1. Wolff, G. Kompa, and R. Mehran, “Calculation method for microstrip discontinuities and T-junctions,” Electron. Lett., Vol. 8, 1972, pp. 177-179.

2. G. Kompa, and R. Mehran, “Planar waveguide model for calculating microstrip components,” Electron. Lett., Vol. 11, 1975, pp. 459-460.

3. T. Okoshi, Planar Circuits for Microwaves and Lightwaves, Springer-Verlag, Berlin, New York, 1983.

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