I need your help: Antenna Design - Reflectarray Antenna

Hello all,

For my final undergraduate program I will be designing a reflectarray antenna. I have studied how they work, but I am confused about which software to use.

My reflectarray antenna will be excited by a horn antenna.

The elements will either be Aperture Coupled stub lines or just stub lines.

Can any of you please suggest any software for this and any tutorials?

The size of the reflectarray will be less than 30 cm X 30 cm.

Thank you for your help.

All help is appreciated.

Thanks