2.4GHz high-gain sector antenna (or array)

Hi, everyone. I have a question about the design of a high-gain sector antenna working for 2.4GHz. The antenna should have a 120 degree beam width in horizontal plane. The gain should be as high as possible.

I am wondering which types of antenna or antenna array should be used in this case? Is the slot-array can be used for this propose? I appreciate any references or any information about it.

Thanks