longitudinal shunt slot antenna array environment

I want to design a unit cell of shunt longitudinal slot in array environment and get its resonant length curves vs offset. I have already designed a single isolated slot in HFSS and got its resonant response following Elliot and Stegens work. However I want to get the resonant response in an array environment without going into the analytical work. I cant understand how to apply periodic or Floquet port in HFSS to solve this.

TIA