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- 实验方案
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[IEEE 2018 IEEE International Conference on RFID Technology & Application (RFID-TA) - Macau, Macao (2018.9.26-2018.9.28)] 2018 IEEE International Conference on RFID Technology & Application (RFID-TA) - RWC: A Robust Wireless Charging System for Dockless Bike-Sharing
摘要： Bike-sharing, especially dockless bike-sharing, making a sensational progress of public transportation recently. The implementation of smart locking/unlocking module for shared-bikes has produced the issue of how to charge those modules efficiently for shared-bikes. Existing shared-bike charging technologies rarely take charging delay or user experience into consideration. In this paper, we propose RWC, a robust wireless charging system for dockless bike-sharing, which can provide stable recharging service without decreasing bike-sharing system’s service quality. RWC recharges shared-bikes via radio frequency (RF) energy harvesting. We design an RF wireless charging sensor node to integrate it on a bike’s basket, such that the mutual interference during charging process and space occupation can be reduced. RWC also includes a charging direction scheduling algorithm to reduce charging delay. The RWC system has been successfully implemented on a dockless bike-sharing system, which proves its effectiveness.
关键词： wireless charging,RF energy harvesting,sensor node,charging delay,Bike-sharing
更新于2025-09-09 09:28:46
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MEMS-Based Thermoelectric-Photoelectric Integrated Power Generator
摘要： This letter presents a novel MEMS-based thermoelectric–photoelectric power generator, which integrates a micro-scale thermoelectric generator (μ-TEG) and a solar cell on a single silicon chip by MEMS technology for the first time. To optimize the heat flux path of μ-TEG, one side of the thermocouple square array is on the interdigitated electrode of the solar cell and the other side is on the thick oxide passivation layer to realize thermal isolation. Moreover, the hot side and the cold side are insulated by a thick polyimide thermal insulating layer above the thermopile, and a series of square holes is created to enhance the thermal coupling between the thermopile and surrounding environment. Several common measures, like the back-surface field and oxide passivation layer with limited contact openings, are adopted for the design of the solar cell. All the measuring electrodes are on the same side of the device for the convenience of bonding wire and package. When a sputtered Al membrane covers the front side of the device, the maximum output voltage factor and the power factor of the μ-TEG are 0.149 V · cm?2 · K?1 and 3.03 × 10?3μW · cm?2 · K?2, respectively. When the front and back sides of device receive light, the measured photoelectric conversion efficiencies are 4.45% and 0.682%, respectively.
关键词： energy harvesting,μ-TEG,MEMS,Power generator,solar cell
更新于2025-09-09 09:28:46
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A novel meander line integrated E-shaped rectenna for energy harvesting applications
摘要： In this article, design of a novel meander integrated E-shaped rectenna is presented. The designed rectenna operates at ISM frequency range from 2.2 to 2.5 GHz with acceptable reflection coefficients, gain and VSWR values. The designed rectenna is simulated using HFSS 15 (High Frequency Electromagnetic Field Simulation) and FR4 epoxy material is used in rectenna design for low cost having dielectric constant of 4.4 and thickness of 1.6 mm. In the rectifying stage full wave voltage doubler circuit is designed for DC power generation with SMS7630 Schottky diode and lumped circuit elements. The impedance matching circuit between the antenna and the rectifier is designed and simulated using advanced design system (ADS) software for efficient power transmission from the antenna to the load. The simulation and measurement results with different load and input power levels prove that the designed and implemented system can be used for low power energy harvesting applications in order to feed electronic components and battery free sensor networks.
关键词： rectenna,meander line microstrip antenna,RF energy harvesting
更新于2025-09-09 09:28:46
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Phase structure analysis and pyroelectric energy harvesting performance of Ba(Hf <sub/><i>x</i> </sub> Ti <sub/> 1 <i>-x</i> </sub> )O <sub/>3</sub> ceramics
摘要： Ba(Ti1-xHfx)O3 ceramics were synthesized by a solid-state reaction process. The evolution of the phase structure was identified by XRD spectrum, dielectric spectroscopy and temperature-dependent Raman spectroscopy for the Ba(Ti1-xHfx)O3 ceramics. In addition, pyroelectric energy harvesting properties based on the Olsen cycle were investigated for the first time. A maximum pyroelectric energy harvesting density value of ND=491.30 kJ/m3 (ΔT=120 °C, EH=50 kV/cm) was achieved in the Ba(Hf0.05Ti0.95)O3 ceramic. Compared with those of BT, the values of ND more than doubled in the temperature range from ΔT=60 °C to ΔT=100 °C in the Ba(Hf0.05Ti0.95)O3 ceramic and even increased 3.2 times at ΔT=80 °C near the Curie temperature (TC) of the Ba(Hf0.05Ti0.95)O3 sample. In addition, a larger pyroelectric energy harvesting density value of ND=367.10 kJ/m3 (ΔT=120 °C, EH=50 kV/cm) was acquired in the Ba(Hf0.12Ti0.88)O3 ceramic. Values of ND-BHT5/ND-BT and ND-BHT12/ND-BT were analyzed in the Ba(Ti1-xHfx)O3 ceramics. The optimal pyroelectric properties can be obtained in the vicinity of the ferroelectric to paraelectric phase-transition region.
关键词： Phase transition,Lead-free ceramics,Raman spectra,Ferroelectric materials,Energy harvesting
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE 13th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) - Singapore, Singapore (2018.4.22-2018.4.26)] 2018 IEEE 13th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS) - Vibration Energy Harvester Driven Wearable Biomedical Diagnostic System
摘要： Smart fabric technology (SFT) makes easier to monitor physiological parameters. Smart Fabric technology or An electronic textile (e-textile) is prepared by incorporating wearable systems along with sensors deployed for body parameters which are used by doctors as markers to summarize health status. Such existing systems are battery driven and required cumbersome maintenance .It is the main cause for limited life span and lack of biocompatibility. These limitations are well addressed by proposing energy harvesting device (EHD) as an alternative to battery. It is basically an energy transduction mechanism in which vibration energy converted to useful electrical energy. This work focuses on low cost fabrication of EHD to make SFT self powered. The fabricated device is built out of polymer substrate , silver electrodes and zinc oxide as piezoelectric material .The devices have been characterized and found electric potential of 2.51Vpeak, 0.76Vrms whereas power was 12.61μWpeak, and 1.18μWrms for 500K(cid:159) load at 53Hz peak resonant frequency. The power demand of commercially available cardiac sensor, adaptive pace maker, pulse oxymeter, sensor node demand power in the range of 1(cid:541)W to 100(cid:541)W .This reveals feasibility of energy harvester as an power source for SFT. Array of series and parallelly connected EHD can be deployed for fulfilling demand of integrated SFT.
关键词： Energy harvesting device,Biomedical sensing,e-Textiles
更新于2025-09-09 09:28:46
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Effect of elastic modulus of cantilever beam on the performance of unimorph type piezoelectric energy harvester
摘要： Piezoelectric energy harvesting is a technique that can utilize ambient vibration energy to generate useful electrical energy, which is promising for powering small-scale autonomous devices such as sensors for wearable, biomedical, and industrial applications. Typically, cantilever-type piezoelectric energy harvesters (PEHs) are operated under resonance condition to achieve the maximum output power at low frequency stimuli. Along with resonance matching, it is also necessary to optimize the PEH configuration with high electromechanical properties for the efficient energy conversion. The purpose of this study is to investigate the effect of the elastic modulus of the passive layer in the cantilever structured PEH on the electromechanical properties and thus harvesting performance. In this regard, two unimorph type PEHs having the identical geometry, piezoelectric properties, and proof mass but with different elastic modulus (55 GPa and 97 GPa) of Ti alloy-based passive layers were fabricated and their output performance was compared under the same acceleration amplitude excitation stimuli. The PEH with the smaller elastic modulus passive layer exhibited almost 53% improvement in the maximum power than that with the higher elastic modulus passive layer, which is attributed to a smaller mechanical damping ratio, higher quality factor, and larger vibration amplitude.
关键词： vibration energy,piezoelectric energy harvesting,cantilever beam,elastic modulus,unimorph type
更新于2025-09-04 15:30:14
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[Solid Mechanics and Its Applications] Piezoelectric Shells Volume 247 (Sensing, Energy Harvesting, and Distributed Control—Second Edition) || Linear/Nonlinear Piezoelectric Shell Energy Harvesters
摘要： Development of energy harvesting technologies, e.g., converting vibration energy to electric energy, has attracted much attention in recent years. Among the proposed technologies, piezoelectric energy harvesters can easily convert the vibration induced energy to useful electric energy with the electromechanical coupling of piezoelectricity. Most piezoelectric energy harvesters have been designed based on various non-shell structures, such as cantilever beams and plates. Electromechanical coupling mechanism and distributed sensing of shell structures, which are commonly used in aerospace, civil and mechanical systems, also have captured researchers’ attention for decades. However, most of them only considered the signal generations in the open-circuit condition and the sensing theory becomes impractical when it is used to power electric devices whose impendence can no longer be ignored. Therefore, the output energy across a resistive load in a closed-circuit condition for the shell energy harvesters should be exploited. Accordingly, this study focuses on a development of a generic piezoelectric shell energy harvesting mechanism that can be simplified and applied to many linear/nonlinear shell and non-shell distributed energy harvesters.
关键词： shell structures,energy harvesting,electromechanical coupling,vibration energy,piezoelectric
更新于2025-09-04 15:30:14
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[IEEE 2018 Photonics North (PN) - Montreal, QC, Canada (2018.6.5-2018.6.7)] 2018 Photonics North (PN) - Double Hot-Spot Dual-Polarization Chand-Bali Nanoantenna for NIR Detection Applications
摘要： In this work, we introduce a novel design of a gold nanoantenna array. The nanoantenna consists of two elliptical patches. A vertical oval coincides with the minor axis of the horizontal oval. An elliptical aperture etched out from the horizontal one resulting in our Chand-Bali shaped nanoantenna. The geometrical dimensions are properly selected such that two symmetrical small gaps are created. The electric field intensity has a significant enhancement in these two gaps at the same resonance frequency within the near-infrared (NIR) regime for both orthogonal polarizations. The new design offers an improved performance for IR detection and harvesting applications.
关键词： energy harvesting,nanoantenna,NIR,dual polarization,electric field enhancement
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Dual Polarized Metasurface for Microwave Energy Harvesting and Wireless Power Transfer
摘要： We introduce the design of a dual polarized metasurface collector based on the metamaterial full absorption concept for electromagnetic energy harvesting. Different from previous metamaterial absorber designs, here the power absorbed is mostly dissipated across a resistive load rather than in the dielectric substrate. This is achieved by channeling the absorbed power to an optimal resistive load through a via hole. The simulation results show that power absorption efficiency of 98% is achieved at an operating frequency of 2.5 GHz for a single unit cell. A super unit cell consisting of 4 cells with alternating vias was also designed to produce a dual polarized metasurface. The simulation results yielded a radiation to AC efficiency of around 90% for each polarization.
关键词： metamaterial,dual polarized,wireless power transfer,metasurface,microwave energy harvesting
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Multi-Polarization Planar Dipole Array Surface for Electromagnetic Energy Harvesting and Wireless Power Transfer
摘要： We present a design of a multi-polarization electromagnetic energy harvesting surface inspired by a multi-layer unit cell of printed asymmetrical metallic dipolar elements. The harvesting array features two layers that collectively capture the incident energy from various incident angles. The harvester was ?rst analyzed for maximizing radiation to AC absorption where each dipole was terminated by a resistor across its energy-collecting gap. The simulation results show an average ef?ciency of 90% for the radiation to AC conversion at various incident angles. As a proof of concept, a multi-layer array consisting of 3x3 asymmetrical dipolar elements of the de?ned multi-layer unit cell was fabricated and measured experimentally. The experimental results yielded an overall radiation to DC harvesting ef?ciency of 70% for multiple incident polarizations.
关键词： dipole array,electromagnetic absorber,wireless power transfer,rectennas,Energy harvesting,recti?cation
更新于2025-09-04 15:30:14