Electromagnetic Energy Harvesting Using a Glass Window
Keywords:Electromagnetic energy harvesting, glass dielectric substrate, metamaterial, patch antennas, rectenna
AbstractIn this work, a new rectenna constructive and conceptual model, using glass as dielectric substrate, was proposed. This research aims to produce a window for building facades that can harvest the electromagnetic energy available in the environment. For this proposal, a patch antenna with an opening was designed with two main objectives: have a low value of S11 parameter and allow the maximum visibility through the glass. In order to accomplish an efficient radio frequency to direct current conversion, a voltage doubler rectifier was designed and built in the same glass substrate directly connected to the antenna. The final window is a system composed of eight individual rectennas associated in parallel. For improving the window energy harvesting ability, a metamaterial structure was added to each rectenna element, which acts in order to increase the patch antennas gain. Each rectenna was designed using both Advanced Design System and Computer Simulation Technology software and optimized to operate at 2.45 GHz. The measured results show that the proposed rectenna model is an efficient solution to improve the total amount of harvested energy, which is enough to power low consumption load.
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