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Open Microstrip Line with End Effect (EM Base): MLEFX



Name Description Unit Type Default
ID Element ID Text MO1
W Conductor width Length W[1]
L Conductor length Length L[1]
MSUB Substrate definition Text MSUB#[2]
*AutoFill AutoFill database if not equal to 0   0

[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.

* indicates a secondary parameter

Implementation Details

This model implements an X-model of the microstrip open ended line. For a more detailed discussion of the X-models see EM-based Models (X-models) . This model does not include the effects of dielectric, conductor or radiation losses.


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.


0.05 ≤ W/H ≤ 8 Recommended εrnominal ≤ 16 Recommended
0 ≤ Frequency ≤ Fmax[1] Recommended 1 ≤ εrnominal Required
(100*|εrrnominal|) ≤ 20% Required (100*|εrrnominal|)/εrnominal ≤ 10% Recommended

[1] The frequency limits of this model are dynamic with respect to the dimensions of the discontinuity. This dynamic frequency limit is displayed to the user via warning messages for the relative size, and dielectric in use. Importantly, this recommended frequency limit will change as a function of the largest width in the discontinuity for a given substrate definition. The frequency limit warns the user that at least one of the transmission lines constructing the discontinuity is approaching the frequency limit where multiple modes can propagate. See the section marked "Upper Frequency Limitations" in the General Discussion of the X-models.


This model was developed under research performed at Cadence Design Systems, Inc. The details of the implementation are considered proprietary in nature.

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