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(Obsolete) Coplanar Line (EM Quasi-Static): CPW1LIN

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This element is OBSOLETE and is replaced by the Single Conductor Coplanar Line (EM Based Quasi-Static) (CPWLINX), Coplanar Line (EM Quasi-Static) (CPW1LINE), or Coplanar Line (Closed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
S1 Left gap width Length 0 um
S2 Right gap width Length 0 um
ShI Cover shield presence indicator   0
SbI Backing shield presence indicator   0
L Conductor length Length 0 um
Acc Accuracy parameter   1
CPWSUB Substrate definition Text  

Implementation Details

This circuit component models a section of coplanar waveguide on a shielded substrate. The parameters W (conductor width), S1, S2 (S1 - gap between conductor and the left ground halfplane; S2 - gap between conductor and the right ground halfplane) and L (conductor length) are dimensions entered in the default length units. Left and right directions are defined in respect to the line of sight from port 1 to port 2.

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 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.

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 can have metallic grounded shield backing the substrate and metallic cover. Presence of backing shield is controlled by indicator Sbi. If Sbi is set to 0, backing shield is absent; if Sbi is set to 1, backing shield is present. Presence of cover is controlled by indicator Shi. If Shi is set to 0, cover is absent; if Shi is set to 1, cover is present.

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 substrate.

The component accounts 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.

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.

References

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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