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project presentation

on 31 December 2012

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Transcript of RF_energy_harvesting

RF Energy Harvesting... Antenna the design frequency is 952 MHz
(the center of the GSM 900 MHz) Microstrip patch antenna is very simple in construction simulation done using IE3D RF harvester testing.. Idea of Rectenna Introduction 900 MHz
GSM The antenna structure was simulated and, the return loss was plotted as function of the frequency. found to be approximately -29.51 dB Return Loss
was measured using the Spectrum Analyzer
-It is clear that the antenna has a good return loss around 952 MHz. Moreover, it has a good return loss at GSM 1880 MHz. Rectifier the value of the capacitor must be carefully chosen Choosing the Diodes type Using a clamper circuit in series with the rectifier circuit to raise the signal level up. Schottky diodes
have low forward voltage (0.17- 0.34 V). The critical point was the diode forward voltage QUESTIONABLE DESIGN (1 nF)capacitor
high voltage results showed that as the input power changes, the rectifier input impedance also does simple rectifier and the single stage voltage doubler have the best conversion efficiency The number of stages
was determined,
through running
number of simulations. One major problems of this antenna is its narrowband behavior, which causes problems in RF harvesting! Two stages rectifier Conclusion Antenna Rectifier matching network Design steps structure reliability mobility high efficiency simplicity to capture a significant amount of power to converts an AC input into a DC output there are limitations on the diodes type, and capacitors values simple rectifier Matching circuit
to avoid power losses L- Network represents the simplest type of the available matching networks matching can be made by many methods optimization by
Ansoft Designer
was chosen here L-Network Right Angle Isosceles Triangular Patch Antenna RAITPA using IE3d (full wave simulator) Parameters of the RAITPA The antenna prototype 2 4 5 Layout of RAITPA Return loss Measurements showed that
the power level was approximately – 15 dBm using Spectrum Analyzer The operation of such a rectifier Two stages rectifier single stage Villard multiplier HSMS2820 0.34 V forward voltage Comparison between different orders
of rectifier based on efficiency Comparison between different orders
of rectifier based on the output voltage. Implementation Simulation results Return loss -21.52 dB at 951.5 MHz power of +5 dBm on the RF meter 1 nF capacitor was replaced by a 22 uμF capacitor in order not to allow the
capacitor to quickly discharge Shaimaa’ Nasser
Aseel Zeinati ThE eNd Prof. Nihad Dib Supervised by ^_^
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