Cavity backed slot antenna arrays for conformal antenna applications are provided. A cavity backed slot antenna array may include an aperture, first and second feed structures, and a backing cavity configured to support the aperture and the first and second feed structures. The aperture may have a dielectric layer and a metal layer disposed on the dielectric layer. The metal layer may have first and second annular regions. The first annular region may have a first slot region and the second annular region may have a second slot region, where the second slot region may partially overlap the first slot region. The metal layer may further include first and second radiating elements configured to radiate energy. Each of the first and second feed structures may include a central portion and a plurality of fin structures arranged radially around the central portion.