Learning Forum

[DMARATHE]

Hi Elliop,

Thanks for posting your query on Ansys Learning forum. I could see from second image that you have setup a CPW line with two side grounds.

There are certain recommendations for exciting CPW lines with wave ports. They are regarding the sizing of wave ports:

Wave Port Size:

A Rectangular Apertured with Port width and Hight should no less than 3*(2g+w) and 4*h respectively.

Where, h= dielectric height, g = spacing between signal and side ground, w = width of signal trace.

Port should be centred horizontally on CPW trace. The port should be exposed to simulation volume or if internal need to be capped by PEC block. The wave port outline should contact all side grounds and size should not exceeds lambda/2 in any dimension to avoid rectangular waveguide excitations.

In your case based on description, I understand that line structure is inside simulation volume therefore PEC caps are required for wave ports. You can know more about this from HFSS help PDF.

Kindly assign radiation boundary to air box/simulation box enclosing line structure.

Thanks,