Integrated filtering planar dipole antenna using edge coupled feed

Abstract

Abstract-The paper presents a novel uniplanar integrated filtering dipole with a second-order filtering response of enhanced frequency selectivity. The first stage of the filter is a Ushaped half-wavelength resonator, whereas the second one is the planar dipole antenna. The bandwidth of the dipole is controlled by the edge coupling between the two stages. The U-shape resonator also acts as a balun. A truncated microstrip ground plane is used as the reflector to achieve a directional radiation pattern. The measured results show a bandwidth of 21% between 4.2 GHz and 5.2 GHz with a sharper roll-off than a conventional planar dipole, and an end-fire radiation pattern.