Mimo antenna designing for 3.5 ghz -- 2

I'm seeking an expert in HFSS to design a patch antenna for wireless communication.
I have designed a mimo antenna according to me ,now what i need is to modify it and get my desired results.
Desired results:-
Make the mimo antenna resonate at 3.5 ghz
Good S21 value(isolation)
Good return loss and s11 value
Less ecc value for mimo antenna

Key Requirements:
- Operate in a specific frequency range 3.5ghz

Ideal Skills and Experience:
- Proficiency in HFSS software
- Experience in patch antenna design
- Knowledge of wireless communication systems
- Ability to provide detailed design documentation