Feeding for QHA arrangement

Hello, I was thinking about how to feed a QHA arrangement with either Balun or direction couplers in HFSS. I want to fabricate and later test my QHA design also, so i don't think i can use the feeding type that is used by the ADK. I read through literatures and found that i can feed it through 3-db Direction Coupler or Baluns to achieve phase quadrature. But still can't grasp enough to put it in HFSS.

How do i design direction couplers or Baluns in HFSS?? Anyone has any guide or .hfss file for this??