Go to www.awrcorp.com
Back to search page Click to download printable version of this guide.

Microstrip Bend Optimally Mitered Arbitrary Angle (Closed Form): MBENDA

Symbol

Topology

Parameters

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

Miter (M) is computed as a function of Angle and W/H.

Name Description Unit Type Default
ID Element ID Text TL1
W Conductor width Length W[1]
ANG Angle of bend Angle 90 Deg
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 Microwave Office Layout Guide for details.

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

Restrictions

0 ≤ ANG ≤ 120 Recommended

T/W ≤ 0.1 Recommended

W/H ≥ 0.25 Required

ωr ≤ 16.0 Recommended

1 ≤ ωr Required

Implementation Details

This circuit component models an optimum Miter of an arbitrary angled bend in the Microstrip signal conductor. The model assumes a Quasi TEM mode of propagation matched to a Microstrip line of width (W) and incorporates the effects of dielectric and conductive losses. The basis of the model is a curve fit of experimentally determined optimum miters at specific angles within the specified range. At this time, the optimal miter percentage must be interpolated from the following table. The parameter W (Strip Width) is a dimension entered in the default length units. The parameter MSUB specifies the Microstrip Substrate element, which defines additional cross sectional parameters of the transmission line. M = 100 (x/d)

W/H 0 Deg 30 Deg 60 Deg 90 Deg 120 Deg
0.5 0% 12% 45% 75% 98%
1.0 0% 19% 41% 63% 92%
2.0 0% 7% 31% 56% 79%

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.

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

Wadell, Brian C. "Transmission Line Design Handbook" Artech House 1991, pp. 294-296

Please send email to awr.support@ni.com if you would like to provide feedback on this article. Please make sure to include the article link in the email.

Legal and Trademark Notice