Patent ID: 7528698
Filing Date: 2009-05-05
Classification: G06K,H02J

Abstract:
1. An energy harvesting circuit, comprising: a plurality of antennas, each of said antennas being fixedly tuned to the same particular RF frequency range, each of said antennas being structured to receive an RF signal having said particular RF frequency range and output a respective AC signal; a plurality of matching networks, each of said matching networks being operatively coupled to a respective one of said antennas and being structured to receive the AC signal output by said respective one of said antennas; and a plurality of voltage boosting and rectifying circuits, each of said voltage boosting and rectifying circuits being operatively coupled to a respective one of said matching networks and being structured to receive the AC signal received by the respective one of said matching networks and output a DC voltage signal by converting the received AC signal into the DC voltage signal; wherein the DC voltage signals output by the voltage boosting and rectifying circuits are summed together to create a combined DC voltage signal, and wherein an impedance of each of the matching networks is chosen in manner so as to maximize a voltage level of the DC voltage signal that is output by the associated one of the voltage boosting and rectifying circuits.