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Stripline Gap in Conductor (Closed Form): SGAP




SGAP$ is an iCell. See “Intelligent Cells (iCells)” for more information.

Name Description Unit Type Default
ID Element ID Text SL1
W Conductor width Length W[1]
S Gap width Length W[1]
SSUB Substrate definition Text SSUB[2]

[1] User-modifiable default. Modify by editing under $DEFAULT_VALUES in the default.lpf file in the root installation directory.

[2] If only one SSUB is present in the schematic, this substrate is automatically used. If multiple SSUB substrate definitions are present, you must specify which to use.

Implementation Details

The series gap results in a dominantly series capacitance of a relatively small value. This model does not include the losses associated with the dielectric or conductor and is based on static solutions of a zero thickness strip.

W (Stripline Width) and S (Gap Width) are entered in the default length units.

SSUB references a Stripline substrate, which defines cross sectional parameters.


This element does not have a visual layout cell. The layout cell creates a gap between the two microstrip or stripline elements that connect to each side. The size of the gap is determined by the S parameter. Since there is no layer to draw, linetypes do not apply. You can select the layout cell to snap the microstrip or stripline elements to it.


W/B≥0.2 Recommended

S/T≥5 Recommeneded

Recommendations for Use

Discontinuity models function most accurately when attached to lines that match their corresponding edges. Directly connecting discontinuity models to one another reduces their accuracy.


[1] A.A. Oliner, _Equivalent Circuits for Discontinuities in Balanced Strip Transmission Line_ IRE Transactions on Microwave Theory and Techniques, March 1955 p.134-143

[2] H.M. Altschuler and A.A. Oliner, "Discontinuities in the Center Conductor of Symmetric Strip Transmission Line", IRE Transactions on Microwave Theory and Techniques, May 1960 p.328-339

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