| Abstract: | Microwave wireless power transmission has obtained widespread attention as a long-distance energy transmission technology, however the electric field rapidly decays with distance increase. In order to slow down the trend of electric field attenuation and improve the power of the receiver, a phase calculation expression for generating non diffractive beams is derived in this paper. In addition, a phase control unit with a phase coverage of 360° and a transmission coefficient better than -3dB was designed, and a metasurface with an aperture of 500mm was designed based on this unit. Simulation and measurement result show that, after loading the electromagnetic metasurface, the electric field is significantly enhanced and the energy is more concentrated. The experimental results of microwave wireless transmission show that when the total transmission power is 36dBm, the maximum power received by the receiver can be increased by 9 times compared to the case without an electromagnetic metasurface, which proves that the designed metasurface can help to improve the transmission efficiency of microwave energy transmission systems. |
