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Reconfigurable Printed Yagi-Uda Star Array for RF Power Transmission and Harvesting Systems

In this paper, we propose an array of Yagi-Uda antennas positioned in a star shaped fashion where panels are extending outward from a cylindrical axial support. The advantage of usingYagi-Uda antennas is that they have an end-fire radiation pattern which minimizes the reflection and polarization issues compared to microstrip antenna arrays, and gives rise to a simpler and a more cost-effective design. Elements with different orientations or polarizations can beconfigured to enable a large number of antenna elements confined in a compact space (i.e.: a cylinder) radiating efficiently, and potentially in all directions equally. The number of antennas in addition to the number of panels can be controlled electronically and/or mechanically to enable different types of radiation patterns. It is evident from our preliminary results that a higher effective omni-directional gain is enabled which contributes to the total radiated power as described by Friis equation.