how to understand field distribution in CST

during design afilter ic CST i need to understand field distribution at specified frequency , please can any one help me ?

Hi,
You need to create one or more monitor E-field (by solve menu), and you can choose frequency in this.
After the simulation, you will find the 3D results : adjust the view parameters to visualize properly the fields (you can extract severals 2D plane of).
BR