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Multiple Edge Coupled Microstrip Lines (EM Quasi-Static) (X=3 to 16): MXCLIN



This set of circuit components models sections of multiple edge coupled microstrip lines on a single-layer dielectric substrate. The model name includes the number of coupled lines (>=3): M3CLIN, M4CLIN and so on, up to M16CLIN. A backing ground plane is always present.


Name Description Unit Type Default
ID Name Text TL1
W1 Width of microstrip line Length W1
W2 Width of microstrip line Length W1
Wn, n=3..XX - number of lines Width of microstrip line Length W1
S1 Spacing between lines Length W1
Sn, n=2..XX - number of lines Spacing between lines Length W[1]
L Physical length Length L[1]
Acc Accuracy parameter   1
MSUB Substrate name Text MSUB[2]

[1] User-modifiable default. Modify by editing under $DEFAULT_VALUES in the default.lpf file in the root installation directory.

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

Implementation Details

Model implementation is based on the EM Quasi-Static technique described in [1]. It accounts for losses in metal and in substrate dielectric. Dispersion is partly included.

These circuit components model sections of multiple edge coupled microstrip lines. M3CLIN models three edge coupled microstrip lines, M4CLIN - four, M5CLIN - five, M6CLIN - six, and so on up to M16CLIN. Two edge coupled microstrip lines are modeled by M2CLIN; Help for this model is provided separately.

The parameters W1 ..WX (strip widths), S1.. SX (gaps between strips), and L (line length) are dimensions entered in the default length units. Here X stands for the number of coupled lines that is different for each model.

The Acc parameter 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 set automatically to 2. A larger value of Acc increases the density of mesh used in computations. Accuracy of model parameters may gain slightly from increasing Acc at the expense of a noticeable growth of computation time. Generally, a good trade-off between accuracy and computation time is to set Acc to 1.

The MSUB parameter specifies the microstrip substrate element, which defines additional cross-sectional parameters of the transmission line. If blank, a default is used.

These components do not impose restrictions on conductor thickness (the thickness may be zero, positive, or negative). Negative thickness means that the conductor is recessed into the substrate.

The components account for losses in metal and in substrate dielectric. Dispersion is not included.

NOTE: The implementation of EM Quasi-Static 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.


This element does not have an assigned layout cell. You can assign artwork cells to any element. See “Assigning Artwork Cells to Layout of Schematic Elements” for details.


[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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