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2 Edge Coupled Striplines (EM Quasi-Static): S2CLIN

Symbol

Parameters

Name Description Unit Type Default
ID Name Text TL1
W1 Conductor 1 width-nodes 1&&3 Length W[1]
W2 Conductor 2 width-nodes 2&&4 Length W[1]
S Gap width - conductors 1&&2 Length W[1]
L Conductor length Length L[1]
Acc Accuracy parameter none 1
SSUBL Substrate definition Text [2]

[1] If only one SSUBL is present in the schematic, this substrate is automatically used. If multiple SSUBL substrate definitions are present, you must specify which to use.

[2] If only one SSUBL is present in the schematic, this substrate is automatically used. If multiple SSUBL substrate definitions are present, you must specify which to use.

Implementation Details

This circuit component models a section of two edge coupled striplines. The model allows the thickness and characteristics of dielectrics at both sides of striplines to be different.

The parameters W1, W2 (strip widths), S (gap between strips) and L (line length) are dimensions entered in the default length units. The parameter SSUBL specifies the two-layered stripline substrate element, which defines additional cross sectional parameters of the transmission line. If blank, a default is used.

The parameter Acc is the accuracy parameter (1<=Acc<=10). The default value for Acc is 1. If Acc is less than 1 or greater than 10 it is sets automatically to 2. Larger value of Acc increase density of mesh used in computations. Accuracy of model parameters may gain slightly from increasing Acc at the expense of noticeable growth of computation time. As a rule of thumb, good trade-off between accuracy and computation time is to set Acc to 1.

This component doesn't impose restrictions on the conductor thickness (thickness may be zero, positive, or negative). Negative thickness means that the conductor is recessed into the underlying dielectric layer.

NOTE:The component accounts for losses in metal and in substrate dielectric. Dispersion is not included.

The implementation of advanced models heavily relies on the involved numerical algorithms. This may lead to the noticeable increase of computation time for some schematics that employ many models of this kind.

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.

References

[1] M.B. Bazdar, A.R. Djordjevic, R.F. Harrington, and T.K. Sarkar, "Evaluation of quasi-static matrix parameters for multiconductor transmission lines using Galerkin's method," IEEE Trans. Microwave Theory Tech., vol. MTT-42, July 1994, pp. 1223-1228

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