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Microstrip Step in Width (Closed Form): MSTEP



MSTEP$ is a Microstrip iCell with no parameters. See “Intelligent Cells (iCells)” for more information.

Name Description Unit Type Default
ID Element ID Text TL1
W1 Conductor width @ node 1 Length W[1]
W2 Conductor width @ node 2 Length W[1]
MSUB Substrate definition Text MSUB#[2]

[1] User-modifiable default. Modify by editing under $DEFAULT_VALUES in the default.lpf file in the root installation directory. See the AWR Microwave Office Layout Guide for details.

[2] Modify only if schematic contains multiple substrates. See “Using Elements With Model Blocks” for details.

Implementation Details

MSUB indicates the name of the MSUB element to use for substrate characteristics. If blank, a default is used. The step is the reference plane. W1 and W2 are the widths of the connecting microstrips.


This element uses line types to determine its layout. By default, the layout uses the first line type defined in your Layout Process File (LPF). You can change the element to use any of the line types configured in your process:

  1. Select the item in the layout.

  2. Right-click and choose Shape Properties to display the Cell Options dialog box.

  3. Click the Layout tab and select a Line Type.

  4. Click OK to use the new line type in the layout.

See “Cell Options Dialog Box: Layout Tab ” for Cell Options dialog box Layout tab details.

See “The Layout Process File (LPF)” for more information on editing Layout Process Files (LPFs) and to learn about adding or editing line types.

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] G. Kompa, "Design of Stepped Microstrip Components," The Radio and Electronic Engineer, Vol. 48, p. 53, 1978.

[2] B. C. Wadell, Transmission-Line Design Handbook, Artech House, Norwood, MA, 1991.

[3] R. K. Hoffman, Handbook of Microwave Integrated Circuits, Artech House, Norwood, MA, 1987.

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