The disclosure relates to patch antennas for radar or communications applications. Example embodiments include an antenna comprising: a substrate; a ground plane on a first face of the substrate; and a patch antenna on an opposing second face of the substrate, the patch antenna having a lead extending along a central axis and connected to a rectangular radiating element, wherein the rectangular radiating element comprises two slots on opposing sides of the central axis such that the patch antenna has two resonant frequencies within an operating frequency range of the antenna.