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In this article, a multiband compact patch antenna and a multiband rectifier circuit is proposed for a rectenna operating at 2.4 GHz and 5.8 GHz for RF energy harvesting and wireless power transmission. A modified inverted F shape antenna is used as the main receiving component of the rectenna. The antenna has a compact size of 35×40 mm2. The proposed antenna has good impedance bandwidth (for S11< -10 dB) values of 230 MHz and 620 MHz at the resonant frequencies 2.4 GHz and 5.8 GHz, respectively. The gain values are 3.6 dB and 3.3 dB at 2.4 GHz and 5.8 GHz, respectively. Furthermore, an efficient dual band rectifier circuit is presented. The rectifier circuit is a single branch and consists of a matching network, voltage doubler circuit and a load. The proposed rectifier circuit is designed on RT-Duroid 5880 substrate and the HSMS2850 diode is used for rectification. The rectifier achieves very good efficiency at both frequencies i.e., 71 % and 51.9 % at 2.4 GHz and 5.8 GHz respect ....
This paper presents a finite control set based model predictive control (FCS-MPC) for renewable energy based three phase active front end rectifier in both standalone and grid connected mode. The existing control algorithms restrict the individual controller to either control the voltage or the power sharing. The proposed MPC algorithm enables the rectifier to regulate voltage in standalone mode and power sharing in grid connected mode. The authors propose MPC as being a non-linear control, it offers constraint inclusion feature and wide dynamic response range in comparison with other existing non-linear/linear techniques. Proposed MPC control technique has been tested on a 1.5kW 300V DC microgrid in MATLAB/SIMULINK environment. ....
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