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(Obsolete) Coplanar Waveguide Line (Closed Form): CPWLIN

Symbol

Summary

This element is OBSOLETE and is replaced by the Single Conductor Coplanar Line (EM Based Quasi-Static) (CPWLINX), Coplanar Line (EM Quasi-Static) (CPW1LINE), or Coplanar Line (Closed Form) CPWLINE) element.

Topology

Parameters

Name Description Unit Type Default
ID Name Text TL1
W Conductor width Length 0 um
S Gap width Length 0 um
L Conductor length Length 0 um
CPWSUB Substrate definition Text  

Implementation Details

This circuit component models a section of coplanar waveguide. The parameters W (strip width), S (S - gap between strip and the ground halfplanes), and L (line length) are dimensions entered in the default length units. The parameter CPWSUB specifies the substrate element, which defines additional cross sectional parameters of the transmission line and height of the optional metallic cover. If blank, a default is used.

This component accounts for dispersion and losses in metal and in substrate dielectric.

NOTE: Parameter HC (cover height above substrate - from CPWSUB substrate element) is not used in this model.

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.

CPW elements have special configurations for the defined line types. The center conductor geometry draws on all the layers defined in the line type. The spacing to the ground plane is then drawn on negative layers with the same name as all of the layers in the line type. You must then draw the same layers on the positive layer to complete CPW layout. See “Negative Layers ” for more information on setting up processes for positive and negative layers.

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] W.Heinrich, "Quazi-TEM description of MMIC Coplanar Lines Including Conductor-Loss Effects," IEEE Trans. Microwave Theory Tech., vol. MTT-41, Jan. 1993, pp. 45-52.

Layout

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.

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