Architecture of an efficient dual band 1.8/2.5 GHz rectenna for RF energy harvesting

The rectenna is capable to produce 1.8 V from an input power of -20 dBm. [...]the proposed rF energy harvesting system offers a promising solution designed for efficient functionality at a low power level of RF energy in the dual band. [...]nonlinear characteristics of multiband rectifier required careful design to tackle inherently different cases with low input power presence to the energy harvesting circuit. [...]from the challenge, this paper proposes a highly efficient energy harvesting circuit achievable over -30 dBm to 0 dBm (1pW to 1mW) input power at 1.8 GHz and 2.5 GHz dual band operations. [...]the power transfer amount also exhibits a dependence on the received input power, frequency and resistance load of the energy harvester. [...]with the used of tuning parameter for precise pull in Agilent ADS, the optimal component's value can be easily obtained. Since the input resistance of harvesting circuit is higher than the radiation resistance of the antenna, thus downward impedance transformer circuit is applied to the antenna.