MINIATURIZED CROSSED-DIPOLE CIRCULARLY POLARIZED FRACTAL ANTENNA

Abstract

A miniaturized crossed-dipole fractal antenna with circular polarization is presented in this letter. The radiating elements of the antenna were built as the Koch curve, and the antenna was mounted on a specially designed ground plane. The in∞uence of ground plane to beamwidth and axial ratio of fractal antenna is also experimentally studied. The bandwidth of the VSWR 6 1:5 : 1 within 3dB axial ratio for the fractal antenna is about 5.98%. The measured results show that the proposed fractal antennas have good circular polarization property, e-ciency and 23.4{33.5% size reduction comparing with the conventional crossed-dipole antenna. Furthermore, the comparison of the designed antenna and existing technique was also presented. The tested results are in good agreement with that of the simulations.