I guess this link can help me in practical design but i need some help in design it on HFSS,
The design i need to apply it as on Jackson Paper
" Theory, design, and measurement of novel uniform circular antenna arrays for direction of arrival estimation"
" Brad Jackson
Bruce Liao
Sreeaman Rajan
DRDC – Ottawa Research Centre
Sichun Wang
Communications Research Centre Canada "
how he design the antenna using software this what i need
I think direction of arrival may be analyzed without HFSS, some formulas similar to monopulse angle estimation, to see if it is feasible (spacing, substrate size).
Use HFSS to design single patch antenna with any kind of port, and maybe put additional 3 dummy substrate rectangles to analyze how it affects radiation pattern.
I never used HFSS, so not much help here.