Metasurface Antenna Designed for Quasi-Nondiffraction Beam Size Adjustment and Microwave Power Transmission

In this letter, a metasurface antenna (MA) is designed for quasi-nondiffraction beam size adjustment and microwave power transmission. A phase calculation expression is derived to generate different spot sizes of generated quasi-nondiffraction beams. The result shows the metasurface antenna can make the electric field decay slower and apply to various polarization situations. At the same time, the measured result demonstrates that we can adjust the size of the beam by setting the parameters (
d
) of the derived expression. As for the microwave power transmission, the proposed MA can deliver energy further, and the maximum harvested power by the receiver can be up to more than 13 times as much as without metasurface conditions when the transmission power is 0 dBm.