High Gain and Radiation Coverage Antenna Array for RF Power Harvesting

Isotropic and high gain are two highly desired features in the design of rectennas for high and efficient energy harvesting capability. Therefore, in this paper, an efficient design of antenna array is proposed for energy harvesting application at 2.45 GHz frequency band. The array includes eight microstrip antennas (MSAs) elements which are designed based on air superstrate and reflector_ground plane. This has allowed the gain improvement of the structure which is more than 8.20 dB at all the preferred directions. The MSAs elements are vertically positioned to form an octagon which has helped to achieve full 360° radiation coverage at the azimuth with nearly 54° of 3 dB beamwidth at the elevation.