According to certain embodiments, each antenna element 200 in the array has a stacked patch structure. FIG. 2 illustrates an example of a stacked patch radiator in an infinite array environment. The stacked patch element 200 includes a top patch 210 and a bottom patch 220 implemented in a multi-layer patch substrate 230 and positioned above a ground plane 240. The top patch 210 and bottom patch 220 operate in a complementary manner to produce the radiating beam pattern of the antenna element 200. Each of the top patch 210 and the bottom patch 220, as well as the ground plane 240, may be made of a printed conductive material, such as a copper layer, for example. In certain examples, the substrate 230 is made of CLTE-AT, a low-loss RF material that comprises a woven glass or polytetrafluoroethylene (PTFE) with micro-dispersed ceramics forming a composite laminate substrate having a dielectric constant of 3.0. The antenna element 200 includes a waveport 250, which in certain examples may be realized as an RF stripline feed and “H-shaped” open aperture on the ground plane, for coupling signals into and out of the radiating structure. In FIG. 2, the volume 260 illustrated above the antenna element 200 is solely for the purpose of finite element based simulation, as discussed further below.