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Problem

Which CPW line models support backside ground effects?

Solution

The following EM-Based CPW line models support backside ground effects:

  • CPW1LIN
  • CPW1LINE
  • CPW2LIN
  • CPW2LINA
  • CPW2LINE1
  • CPW3LIN
  • CPW3LINA
  • CPWABRGX$
  • CPWABRGX
  • CPWALINE
  • CPWBENDX$
  • CPWBENDX
  • CPWLINX
  • CPWTEEX$
  • CPWTEEX

Note the following:

  • It is possible to remove the effect of the backside ground for these elements.
  • Taking out the backside ground effect for CPW1LINE (EM Quasi-Static) will not produce the same results as CPWLINE (Closed Form). This is because CPW1LINE assumes a substrate of infinite thickness while CPWLINE does not. See Element Help for CPW1LINE and CPWLINE for more information.

  • The *_NOM parameters of CPW_SUB are used only by X-models. They have no effect on CPW line models that are not X-models.

It is recommended that you read Element Help for the CPW line models you plan to use in your design.

 

The following Closed Form CPW line models do not support backside ground effects:

  • CPWLINE
  • CPWLIN
  • CPWEG
  • CPWEG$
  • CPWGAP
  • CPWGAP$
  • CPWOC
  • CPWOC$
  • CPWSC
  • CPWSC$
  • CPWTAPER
  • CPWTAPER$