Embodiments of an aperture expansion flap are disclosed. An aperture expansion flap may be used in conjunction with an antenna to expand an effective aperture of the antenna beyond its physical area, geometry, and orientation. An aperture expansion flap may include one or more resonators which may be tuned to adjust a reflection and/or refraction phase of an incident wireless signal, such that the wireless signal may be reflected and/or refracted at angle of reflection and/or refraction that is different than an angle of incidence.