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This paper presents a nonlinear resonator circuit based on the Duffing equation to enhance the bandwidth of wireless power harvesting and wireless power transfer systems. The Duffing resonator circuit can be implemented with passive components. In this paper, analysis of an electrical Duffing resonator is presented. The detailed discussion of the Duffing resonator’s properties is provided. As a proof...
This paper presents the application of Duffing nonlinear resonator circuits in wireless power harvesters. Such resonators allow the wireless harvesters to maintain high voltage amplitude over a wide bandwidth. Therefore, they can effectively reduce the frequency sensitivity of the harvesters, and can be used to capture energy within a wide frequency spectrum. The theoretical analysis, as well as the...
This paper presents theoretical analysis and experimental results for the optimum impedance matching condition of a rectenna in an EM energy harvester operating at low ambient power densities. The nonlinear behavior around the threshold voltage of the rectifier is analyzed. Closed-form equations for impedance matching and for predicting the dc output power are derived. A medium wave rectenna was designed...
This paper presents an energy scavenger aimed at capturing EM radiation from AM broadcasting stations. Theoretical analysis and experimental results of a small size scavenging circuit are provided. The design of the power processing circuit including boost converter and self-sensing control unit are shown. Test results show that the scavenger can operate within 6 miles from a 50 kW AM broadcasting...
In this paper, a high sensitivity RF energy harvester is presented with a potential application in powering wireless sensors for monitoring the degradation of civilian infrastructures. The harvester captures the ambient energy transmitted from the AM broadcasting stations and provides dc power to a sensor. The harvester discussed here can operate at input power levels as small as-39 dBm and generate...
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