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Microstrip Bend Mitered 90deg (EM Based): MBEND90X

Symbol

Topology

Parameter

Name Description Unit Type Default
ID Element ID Text MS1
W Conductor width Length W[1]
M Miter fraction (0-0.9)   0
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 AWR Microwave Office Layout Guide for details.

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

* indicates a secondary parameter

Parameter Details

W. The intelligent version of this model automatically assumes this width is equal to the attached models at that node.

Implementation Details

This model implements an X-model of the Microstrip 90x Mitered Bend. For a more detailed discussion of the X-models, see Schematics and System Diagrams. This model does not include the effects of dielectric, conductor or radiation losses.

The bend is mitered according to M, defined as M = x/d with the dimensions related by

When M < 0.5, the reference planes of the bend touch at the inside corner. However, when M > 0.5, these planes are pushed away from the corner, as shown in the previous figure. The distance between the inside corner of the bend and its reference planes will be zero, unless M > 0.5, in which case it is

Layout

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.

Restrictions

0.25 ≤ W/H ≤ 8 Recommended ErNom ≤ 16.0; Recommended
0 ≤ Frequency ≤ Fmax[1] Recommended ErNom ≥ 1 ; Required
0 ≤ M ≤ 0.99 Required (100*|ErNom-ErNom|)/ErNom ≤ 10; Recommended
M ≤ 0.90 Recommended (100*|ErNom-ErNom|)/ErNom ≤ 20; Required

[1] Fmax(3)= The frequency limits of this model are dynamic with respect to the dimensions of the discontinuity.

Fmax 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 “Upper Frequency Limitations” for more information.

In this table, H and ErNom are MSUB parameters.

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.

References

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

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