Open AccessFlat-topped beam forming experiment for microwave power transfer system to a vehicle roof
Author(s) -
Takaki Ishikawa,
Naoki Shinohara
Publication year - 2015
Publication title -
wireless power transfer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.275
H-Index - 11
ISSN - 2052-8418
DOI - 10.1017/wpt.2015.5
Subject(s) - rectenna , antenna (radio) , microwave , maximum power transfer theorem , beam (structure) , electrical engineering , power (physics) , antenna array , beam waveguide antenna , optics , periscope antenna , microwave transmission , azimuth , physics , engineering , dipole antenna , telecommunications , voltage , rectification , quantum mechanics
We proposed and examined a microwave power transfer system for electric vehicles (EVs). In this system, electricity is transmitted from a transmitting antenna over an EV to a receiving antenna on the roof of the EV. We used a rectenna to convert the received microwave power to direct current power. The conversion efficiency of a rectenna array is affected by the input power level distribution, and we have to form a flat-topped beam pattern to increase the conversion efficiency. We conducted an experiment to form a flat-topped beam pattern by using a phased array antenna. In this experiment, the output power of each antenna element is uniform and cannot be controlled independently. Hence, we controlled only the output phases of each antenna element and formed a flat-topped beam pattern. The distance between the transmitting antenna and the receiving area is 6.45 m, and the receiving area corresponds to a space in which the azimuth and elevation are in the range of −5°–5°.