how to focus electric field of antenna to 1 point only

Ira

Hi, i'm ira and currently i'm do some project about array antenna for hyperthermia therapy. my project purposely was to design array antenna and focus the electric field of the antennas to 1 focal point only but currently i'm struggling to make sure the electric field of the antenna focus on 1 point at the centre only instead of scattered. By the way, i use  near field. Can anyone help me with this? Here i attached the picture of my design.

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Mel

Hi Ira

Array theory suggests that 3 patch antennas will not achieve your goal.

 

Your question is more about the thinking or the design phase of the project which is something this forum is not intended for.