Example of a microstrip stacked patch antenna. The antenna consists of a probe-fed microstrip patch antenna that is topped by a dielectric superstrate and a parasitic metallic patch. Compared to conventional single-layer designs, microstrip stacked patch antennas typically have a higher broadside gain and a wider bandwidth. 

The expanded view illustrates the main design parameters of the antenna, including the properties of the substrate and superstrate layers, dimensions of the driven patch and the parasitic patch, location of the probe excitation, etc..  These parameters can be adjusted to tailor the antenna for particular design objectives.