Improving Wireless Power Transfer Efficiency With DC/DC Boost Charger by Multi-Sine Excitation at 5.8 GHz

Passafiume, Marco; Collodi, Giovanni; Cidronali, Alessandro

doi:10.1109/lmwc.2022.3160272

Cited by 4 publications

(1 citation statement)

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“…The harvester performances of the architecture proposed in the present work were evaluated with respect to two solutions proposed by the same authors, operating at 5.8 GHz, as well as four solutions proposed by different authors, three of which work at 5.8 GHz and one at 2.45 GHz. In References [21,27], the performances are evaluated under operating conditions when the system is connected to the BQ25570. The first makes use of a matching network that introduces losses and shows (at −5 dBm) an efficiency of about 16%, while the second adopts a matching network optimized for multisine excitation; it shows performance improvements of up to 27% at −5 dBm.…”

Section: The Backcom Node Prototype's Experimental Resultsmentioning

confidence: 99%

Energy Efficient Enhancement in a 5.8 GHz Batteryless Node Suitable for Backscattering Communications

et al. 2023

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This work presents a compact batteryless node architecture suitable with the backscattering communication (BackCom) approach. The key functional blocks are demonstrated at 5.8 GHz, making use of commercially available components involving a DC/DC step-up converter, a 3.3 V data generator, and an ASK backscattering modulator based on a single GaAs HEMT in a cold-FET configuration. The node integrates a patch antenna exhibiting a non-50 Ω optimal port impedance; the value is defined by means of a source pull-based optimization technique aimed at maximizing the DC/DC input current supplied by the RF to DC converter. This approach maximizes the node compactness, as well as the wireless power conversion efficiency. A prototype was optimized for the −5 dBm power level at the input of the RF to DC converter. Under this measurement condition, the experimental results showed a 63% increase in the harvesting current, rising from 145 to 237 μA, compared to an identical configuration that used a microstrip matching network coupled with a typical 50-Ω patch antenna. In terms of harvested power, the achieved improvement was from −13.2 dBm to −10.9 dBm. The conversion efficiency in an operative condition improved from 15% to more than 25%. In this condition, the node is capable of charging a 100 μF to the operative voltage in about 27 s, and operating the backscattering for 360 ms with a backscattering modulation frequency of about 10 MHz.

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Section: The Backcom Node Prototype's Experimental Resultsmentioning

confidence: 99%