Investigation of reflectarray design techniques for 5.8 GHz Fresnel zone power beaming
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Large-scale wireless power transfer using microwaves is a promising technology for power transmission over distances unsuited for physical wire connections, such as between orbit and the Earth. Using large transmitting and receiving apertures, it is possible to focus microwave energy to achieve efficient transfer. This is accomplished by adjusting the phase distribution across the surface of the transmitting array such that it behaves like a Fresnel lens. One method of generating the desired phase distribution is through use of an active reflectarray, comprised of many discrete 2-dimensional unit cells with varying reflection coefficient phases. This thesis investigates the effect of changing the unit cell geometry from square to hexagonal, modifying the individual patch element geometry, and incident pilot signal design for the reflectarray.