|W1||Conductor 1 width - nodes 1&&3||Length||W|
|W2||Conductor 2 width = nodes 2&&4||Length||W|
|S||Gap width conductors 1&&2||Length||40 um|
This circuit component models a section of two edge coupled asymmetrical microstrip lines.
The parameters W1, W2 (strip widths), S (gap between strips), and L (line length) are dimensions entered in the default length units. The parameter MSUB specifies the microstrip substrate element, which defines additional cross sectional parameters of the transmission line. If blank, a default is used.
This model has two implementations: basic implementation and modified implementation. Basic implementation provides frequency-dependent behavior that matches reference ; unfortunately, formulation  is not very good in low frequency and DC region. Modified implementation improves low frequency and DC behavior but demonstrates frequency behavior somehow different from those of basic implementation at frequencies below 10 GHz. For example, model may underestimate total loss if dielectric loss substantially exceeds conductor loss. MACLIN is not intended for modeling substrates with very large loss tangents (say, above 0.02): Loss of this magnitude should be modeled by EM Quasi-Static models.
How to switch between implementations
Right-click on schematic that contain MCLIN model(s), select Options from pull-down menu, than select Modeling Options tab, go to pull-down list "Model compatibility version".
To set all MCLIN models in this schematic to basic implementation select Version 5.53 from pull-down list.
To set all MCLIN models in this schematic to modified implementation select Version 6.0 or Version 6.5 from pull-down list.
Note that switch also affects MCLIN, MCFIL, SCLIN.
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:
Select the item in the layout.
Right-click and chooseto display the Cell Options dialog box.
Click the Layout tab and select a Line Type.
Clickto 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.
Modified implementation of MACLIN better works in time-domain than basic implementation; however, in critical time-domain designs EM Quasi-Static models like GM2CLIN are preferable.
 P.K. Ikalainen and G.L. Matthaei, "Wideband, Forward-Coupling Microstrip Hybrids With High Directivity," IEEE Trans. Microwave Theory Tech., vol. MTT-35, Aug. 1987, pp. 719-725