A Compact Broadband Quasi-isotropic Antenna for Wireless Energy Harvesting Applications

A compact broadband quasi-isotropic antenna is presented in this paper. Slits are established on a tapered crossed dipole antenna to enhance the bandwidth as well as the isotropic antenna performance. The proposed antenna shows an 87 % of impedance bandwidth in the frequency range of 1.8-4.2 GHz. The quasi-isotropic radiation performance, that is, the maximum gain deviation less than 6 dB, is observed for the frequency range of 2.1-3.2 GHz, with a 41.5 % bandwidth. The simulation results are verified experimentally.