Representing coupled feeds in custom geometries of antennas

How do I model a custom vivaldi element with a coupled feeding structure, and create arrays out of it? I found this page that describes how to use pcbStack to add a feeding structure. However, I have two problems with this :

1. The antenna I want to create does not have the substrate covering the entire antenna (only a feedboard) - having a smaller BoardShape than the metal layer throws an error.
2. It is not possible to create linear or rectangular arrays using pcbStack objects (or even customAntennaStl)

I have the vivaldi antenna (modified - with a curved slot, etc) in the form of a customAntennaGeometry. How do I place the feed if I want to make it an equivalent to the coupled feed? And when specifying the feed, aren't two locations to be specified? How do you specify the location of ground (as can be done using pcbStack elements)? Any help (even theory-wise) would be appreciated as I am a beginner with antennas.

Answer 1

[Maadhav Akula]

It is not possible to create linear or rectangular arrays using pcbStack objects (or even customAntennaStl)

You can refer the following - Answer.

[Sreekar Sai Ranganathan]

Yes. That is clear. My main problem is point number 1. Let us say I want to analyse the single element separately - how do I create the antenna such that the metal portion extends beyond the substrate material?

In my case, it will not be such that the whole array is on the same substrate. The feeding board for each element is separate for each antenna (it covers only the coupled feeding structure). So the example pointed out does not work in my case.

Thank you for responding.