Date

8-2011

Degree Name

BS in Electrical Engineering

Department

Electrical Engineering Department

Advisor

Tina Smilkstein

Abstract

This project tests and analyzes the efficiency of directional and omnidirectional antennas in wireless power transfer for charging. The project demonstrates the steps of construction and properties of dipole, monopole, and Yagi Uda antennas. A low power high frequency DC rectifier circuit converts the received RF power from the antenna and stored it as DC voltage on a capacitor. The receiver circuit also estimates the power received by the antenna. Wireless RF power transmission proves to be inefficient for short distances. The best efficiencies of the antennas were under 50% even at 0.1meter. The near field attenuation starts at around 3db every 0.1 meters and slowly decreases. Although the Yagi Uda array improved received power, the attenuation over distance made wireless power transmission impractical.

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