Compact Ultrawideband Antenna on Folded Ground Plane

Abstract

A compact ultrawideband antenna on folded ground plane is proposed, which is a compact and low-profile structure. The proposed antenna mimics the operation of a unit element of the tightly coupled dipole array (TCDA) with modified boundary condition. The antenna does not have the PMC boundary required by the original TCDA, which makes the implementation and the impedance matching of the proposed antenna easy. All the design procedures are explained and confirmed by the EM simulation. The measured results show that the impedance bandwidth (IBW) is 0.72–3.43 GHz (130.6%) for the VSWR $\kappa \alpha $ ) of 0.82 at the lowest operating frequency and an overall dimension of $0.17\lambda _{\mathrm {low}} \times 0.17\lambda _{\mathrm {low}} \times 0.11\lambda _{\mathrm {low}}$ in terms of the wavelength at the lowest operating wavelength.