Optimization of Passive Low Power Wireless Electromagnetic Energy Harvesters

Nimo, Antwi; Grgić, Dario; Reindl, L.

doi:10.3390/s121013636

Cited by 45 publications

(31 citation statements)

References 35 publications

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“…Besides for verifying compliance of RF field exposure with ICNIRP reference levels, the proposed modules can also serve as sensor nodes to evaluate the potential of RF energy harvesting [25]- [28] and wireless power transfer [29].…”

Section: Discussionmentioning

confidence: 99%

Compact Personal Distributed Wearable Exposimeter

et al. 2015

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Abstract-A compact wearable Personal DistributedExposimeter is proposed, sensing the power density of incident radio-frequency (RF) fields on the body of a human. In contrast to current commercial exposimeters, our Personal Distributed Exposimeter, being composed of multiple compact personal wearable RF exposimeter sensor modules, minimizes uncertainties caused by the proximity of the body, the specific antenna used and the exact position of the exposimeter. For unobtrusive deployment inside a jacket, each individual exposimeter sensor module is specifically implemented on the feedplane of a textile patch antenna. The new wearable sensor module's high-resolution logarithmic detector logs RF signal levels. Next, on-board flash memory records minimum, maximum and average exposure data over a time span of more than two weeks, at a one-second sample period. Sample-level synchronization of each individual exposimeter sensor module enables combining of measurements collected by different nodes. The system is first calibrated in an anechoic chamber, and then compared to a commercially available single-unit exposimeter. Next, the Personal Distributed Exposimeter is validated in realistic conditions, by measuring the average RF power density on a human during a walk in an urban environment and comparing the results to spectrum analyzer measurements with a calibrated antenna.

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Section: Discussionmentioning

confidence: 99%

Compact Personal Distributed Wearable Exposimeter

et al. 2015

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“…4). Standard matching techniques [1] may be used to find the required inductive and capacitive reactance that transform the RF source impedance and the diode impedance at a frequency. The circuits realized at �13.56 MHz for inductive coil and for quartz crystal is show in Fig.…”

Section: Rf Power Transmissionmentioning

confidence: 99%

“…L-__ _ impedance matching In [1], the frontend of RF energy harvesters were modeled as coupled resonators. The components were modeled without directly separating the parasitic effects, hence insight into the quantitative effect of the parasitic components on the performance of the wireless RF harvester were not apparent.…”

Section: Introductionmentioning

confidence: 99%

Investigating the effects of parasitic components on wireless RF energy harvesting

Nimo¹,

Albesa²,

Reindl³

2014

2014 IEEE 11th International Multi-Conference on Systems, Signals &Amp; Devices (SSD14)

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This work presents the effect of parasitic components on the performance of wireless RF energy h�rvesters. Since ambient RF power density is low, only optimal wireless RF energy harvesters will be able to power remote microwatt sensors. By knowing the effect of each parasitic component on the performance of wireless RF harvesters, components may be realized or selected that increases the overall efficacy of the harvester. The analytical and experimental investigation of the component parastics on the harvester output performance is compared at various operating frequencies; both at HF and UHF.

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“…The efficiencys are reported between 1.2-72.8 percent in 869-2450 MHz frequency range. Another research [6] focuses on optimization and implementation aspects of the low power energy harvesters. The authors model, design and implement an energy harvester including antennas.…”

Section: Introductionmentioning

confidence: 99%

Experimental RF-signal based wireless energy transmission

Janhunen

Mikhaylov

Petäjäjärvi

2017

2017 European Conference on Networks and Communications (EuCNC)

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Abstract-The distributed measurement and control systems employing wireless connectivity are commonly seen as the key enablers for many novel industry, retail and consumer applications. Even though, the fast spread of large wireless sensor networks today is obstructed by the absence of solutions, which are at the same time dependable, and can minimize both capital and operational expenditures. In this respect the devices, which are powered with the energy collected from their environment, look very attractive. Among all of them, the systems collecting the energy from a designated wireless (i.e., radio frequency (RF)) channel can often enjoy a more stable energy income, which makes them more dependable than their counterparts. Due to this reason, in the current paper we focus on and discuss the key techniques and design aspects enabling development of a real-Iife RF-powered wireless sensor device. Namely, we address the problems of designing an antenna and the energy harvesting circuit with feasible efficiency. In addition, we detail particular aspects related to the design of a sensor node and optimizing its computing and communication. The developed device is tested in harsh environment as a part of a fast rotating mechanical structure, showing the feasibility of the proposed solutions. The technology discussed in the paper is an important part of the upcoming 5G and loT development and deployment.

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Optimization of Passive Low Power Wireless Electromagnetic Energy Harvesters

Cited by 45 publications

References 35 publications

Compact Personal Distributed Wearable Exposimeter

Compact Personal Distributed Wearable Exposimeter

Investigating the effects of parasitic components on wireless RF energy harvesting

Experimental RF-signal based wireless energy transmission

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