This document describes techniques and apparatuses directed at antenna designs with structurally integrated composite antenna components. In aspects, an electronic device includes a mechanical frame having housing components configured to house electronic components. The electronic device further includes a composite antenna having at least one set of co-located antenna patches forming two resonance frequencies. The set of antenna patches includes an upper patch and a lower patch. The upper patch is formed integral to a housing component and operably connected to a feedline and an electrical ground. The lower patch is implemented in a flexible printed circuit board positioned proximately beneath the upper patch and operably connected to the upper patch through the feedline, as well as the electrical ground.