Do you know how HFSS calculated radiation pattern?
Can you tell me how to implement using field calculator?
I want to understand how to implement using equations.
For true far field it is a transform form all the radiation boundaries to infinite sphere, like it is stated in the setup. For details on far-field calculation, which you can simplify down to Fourier transform, there are a plenty of books written on the topics of aperture arrays and Fourier optics.
For near-field, a virtual surface is defined, where the transform is performed with near-field specific field data. It is in the manual in the "Post Processing and Generating Reports" chapter.
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