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Microstrip Transverse Slit (Closed Form): MSLIT

Symbol

Summary

MSLIT models a segment of microstrip line with a transverse slit cut in the middle of the segment. This model accounts for additional resistive loss caused by the slit.

Topology

Parameters

Name Description Unit Type Default
ID Name Text TL1
W Conductor width Length W[1]
L Conductor length Length L[2]
LS Slit length Length L[2]
WS Slit width Length W[1]
MSUB Substrate definition Text MSUB#[3]

[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] 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.

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

Parameter Details

L. The slit is cut at equal distance L/2 from conductor ends.

Parameter Restrictions and Recommendations

  1. Slit length LS cannot exceed 0.9W

  2. Slit width WS cannot exceed 0.9L

Implementation Details

MSLIT accounts for slit excess inductance [1]. It also accounts for frequency-dependent excess resistance introduced by the slit (a modified technique based on [2]).

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

The selection of the L parameter requires attention. The recommended value of L is in the range of 10..20WS.

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