We keep the microstrip feed from Figure 12 and create an inset to find the same impedance point from Figure 11. The gaps distort the radiation pattern of the element, but it is well worth the advantage of being able to connect a standard impedance circuitry straight to the element.
As discussed before, the impedance bandwidth of a basic patch is a couple % at best. The radiation bandwidth is usually much larger and can be up to 50%. Aperture coupling to a patch is a classic impedance bandwidth enhancement technique. The aperture coupled patch has a slot cut in the ground plane under the radiating element as shown in Figures 14 and 15. The slot is excited with a microstrip or stripline transmission line over the slot on the opposite side of the ground plane.