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Microstrip Gap (EM Quasi-Static): MGAP2




MGAP2$ is a Microstrip iCell and has no parameters. See “Intelligent Cells (iCells)” for more information.

Name Description Unit Type Default
ID Name Text TL#[1]
W Conductor Width Length W[2]
S Gap Width Length W[2]
MSUB Substrate definition Text MSUB1[3]

[1] # is automatically incremented as additional TL Element ID's are added to the schematic.

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

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

Implementation Details

W (width of microstrip conductor), S (length of the gap) are entered in the default length units.

MSUB indicates the name of the MSUB element to use for substrate characteristics. If blank, a default is used.

This model is valid within the following ranges (where H is the substrate thickness):

0.5 < W/H < 2.5

0.1 < S/H < 1

1 < εr < 216

Model is represented by a symmetric π-circuit comprising two frequency-independent capacitances. Model is EM-based because capacitance values are interpolated over the data collected with electromagnetic simulation at a single frequency point; model is quasi-static because this frequency is low enough to allow capacitance approximation and dispersion is not accounted for.


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.

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.

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