| Infinite
|-
|}
The design variables in this problem include the side dimensions of the square patch radiator, length and width of the coupling slot and the length of the open microstrip stub. The width of the mircostrip feed line is
4.6mm, which gives a characteristic impedance of 50Ω.
{| class="wikitable"
|-
! scope="col"| Design Variable Name
! scope="col"| Optimal value
|-
| patch_len
| 37.1mm
|-
| slot_len
| 12mm
|-
| slot_wid
| 1.5mm
|-
| stub_len
| 23.5mm
|}