- 标题
- 摘要
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- 实验方案
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Single-Layer Series-Fed Planar Array with Controlled Aperture Distribution for Circularly Polarized Radiation
摘要： We propose a compact circularly polarized series-fed patch array with enhanced radiation performance at S-band. To our best knowledge, no similar single-layer structure has been designed, measured and reported in the literature with equivalent radiation performances in terms of reduced sidelobe-level (SLL) and aperture efficiency as well as compactness and simplicity. The planar array consists of a 50-? microstrip single feed point, offering uniform and efficient excitation of all its elements that enables a broadside beam with high-gain and low sidelobes. A feed network for such aperture control is designed and optimized to provide good impedance matching with a two-point excitation per radiating element, which is based on 0? and 90? meander lines to enable circularly polarized radiation. A structure made by a 4×1 arrangement of square patches is simulated, optimized, and manufactured, providing a realized gain of about 10 dBic and a SLL below ?15 dB. Very good axial ratios and high efficiencies are obtained. The proposed antenna may be of interest for next-generation far-field wireless power transmission systems and other applications including target tracking, radar and internet of things technologies requiring efficient circularly polarized radiation.
关键词： radar,series-fed array,Controlled aperture distribution,wireless power transfer,circular polarization
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Open Circuit Voltages for PERC Local Back Surface Fields Directly Resolved at the Nanoscale
摘要： Millimeter-sized and low-cost sensor nodes can enable future applications of the Internet of Things (IoT), for which the number of sensors is projected to grow to a trillion within the next decades. RF far-field power transfer is a potential technique for wirelessly powering these sensors since it offers flexible configuration of sensor networks, beamforming capability and a large power transfer range compared to near-field approaches. However, system design for RF power transfer needs to be completely rethought to enable this new paradigm of a trillion IoT sensors. This paper, therefore, presents a comprehensive, system-level analysis strategy and a modular framework for investigating the fundamental efficiency components in an RF power transfer chain. Through this detailed analysis, it is demonstrated that the optimal frequency is primarily determined by the antenna size and the quality factors (Q) of components in the matching network. Millimeter-wave frequencies are shown to be optimal for powering mm-sized sensors for practical matching component Q values. An intuitive explanation of our results is also provided, along with insights for the design and practical implementation of RF power transfer systems for the IoT space.
关键词： millimeter-sized sensors,RF-DC converter,matching network,Antennas,wireless power transfer,Internet of Things (IoT)
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Design of Loosely Coupled Transformer of Wireless Power Transfer for Higher Misalignment Tolerance of System Efficiency
摘要： The offset between the primary and secondary couplers of the Loose-Coupled Transformer (LCT) results in deviation in the efficiency of the wireless transmission system. In order to obtain higher efficiency deviation tolerances, a three-loop LCT structure is proposed. The LCT's intermediate couplers are slightly larger than primary and secondary couplers. A 30mm air gap between primary and intermediate couplers exists. The compensation capacitance of the proposed intermediate coupler is variable. Moreover, when the horizontal or vertical offset between the primary and secondary couplers reaches 200 mm or 50 mm, respectively, the intermediate couplers can move with the secondary couplers. At the same time, the proposed LCT control strategy is optimized. A 3-kW prototype was developed for experimental verification, which proved the effectiveness of proposed LCT and control strategy.
关键词： misalignment tolerance of efficiency,moveable intermediate coil,variable compensate capacitor,loosely coupled transformer (LCT),Wireless power transfer (WPT)
更新于2025-09-12 10:27:22
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[IEEE 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) - Xi'an, China (2019.6.19-2019.6.21)] 2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) - Channel Tracking and Hybrid Energy Beamforming for WPT Enabled IoT System with Mobile mMIMO BS
摘要： In this paper, we consider the channel tracking and energy hybrid beamforming for the wireless power transfer (WPT) enabled Internet of Things (IoT) system, where the mobile base station (MBS) serves a set of half-duplex (HD) sensors that are uniformly distributed within its coverage area. A linear Kalman filter based multipath channel tracking and hybrid energy beamforming scheme is proposed by investigating the temporal and spatial properties of channel. Firstly, the Doppler frequency offset (DFO) is compensated through beam alignment and capturing the precise angular information from signals. Then, the multipath channel is tracked during the angle of arrival time (AOAT). Finally, the hybrid beamforming is applied to realize downlink WPT and uplink data transmission. The superiority of the proposed scheme is evaluated through simulations.
关键词： angle of arrival time (AOAT),mobile base station (MBS),wireless power transfer (WPT),hybrid energy beamforming,Kalman filter,Internet of Things (IoT),Channel tracking,Doppler frequency offset (DFO)
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE 13th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG) - Sonderborg, Denmark (2019.4.23-2019.4.25)] 2019 IEEE 13th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG) - Active Class E Rectifier with Controlled Output Voltage for Megahertz Wireless Power Transfer
摘要： Wireless power transfer (WPT) is desirable for its elimination of direct electrical contact, i.e., safer charing solution, water-proof and dust-proof capability, sterile environment application, etc. However, the variable working conditions, such as the coupling coil relative position, can always lead to output voltage ?uctuations. Therefore, output voltage regulation is especially necessary for the charging of electronic terminals. This paper proposes an active Class E recti?er that can perform both high frequency recti?cation and output voltage regulation. The basic working principle of the active recti?er is explained and design guidance is provided. Both simulations and experiments are done to demonstrate the proposed design and desired performance. With the duty cycle control of the active recti?er, an constant output voltage can be maintained under a varying coupling coef?cients and ?nal DC load.
关键词： active Class E recti?er,output voltage regulation,duty cycle control,Wireless power transfer (WPT)
更新于2025-09-11 14:15:04
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[IEEE 2018 International Conference on Smart City and Emerging Technology (ICSCET) - Mumbai, India (2018.1.5-2018.1.5)] 2018 International Conference on Smart City and Emerging Technology (ICSCET) - Wireless Power Transfer via Metamaterial and Superconducting Coil For Electric Vehicles
摘要： This paper focuses on wireless power transfer (WPT) as a practical means for electric vehicle charging using metamaterial slab and superconducting resonating coil. Smart cities has smart vehicles which runs on electricity as its only source, hence a separate station built at the path of journey has two resonating coils, one placed with high-temperature superconducting (HTS) antenna beneath the surface and another with receiver coil placed inside the vehicle having metamaterial slab between it. As superconductor provide large current density and high Q value thus enables HTS antenna to deliver large amount of electricity in spite of a small-scale antenna, thus makes it an efficient power transfer circuit. Experiment result show that resonant method of coupling provides more efficient power transfer using metamaterial slab placed between these coils with much smaller coupling coefficient around 0.2 or less whereas inductive method of coupling has higher coupling coefficient around 0.9 or more . A prototype achieved 40% power transfer efficiency for inserted resonator within 2m distance.
关键词： Wireless Power Transfer,Superconducting Coil,Electric Vehicles,Resonant Coupling,Metamaterial
更新于2025-09-11 14:15:04
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[IEEE 2018 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW) - Montréal, QC, Canada (2018.6.3-2018.6.7)] 2018 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (Wow) - The Optimization of Auxiliary Detection Coil for Metal Object Detection in Wireless Power Transfer
摘要： For the safety of customers and WPT Electrical Vehicles (WPTEVs), Metal Object Detection (MOD) is a necessary module in the whole WPT system design. In this paper, auxiliary detection coil which utilizes the influence of metal objects on the detection voltage is used as the method to achieve the MOD and an equation which can optimize the design of MOD auxiliary detection coil is proposed. To optimize the detection coil, approximate quantitative description of voltage change in the detection coil is done by modeling the effect of a metal object. A comparison between the simulation and equation’s numerical analysis results is presented that verifies the use of proposed equation. The influence of the radius, turns and position of auxiliary detection coil on voltage variation are also analyzed. And at the end of the paper, the testing result is proposed to verify the feasibility of the optimization method of this auxiliary detection coil design.
关键词： metal object detection (MOD),wireless power transfer (WPT),auxiliary detection coil
更新于2025-09-11 14:15:04
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[IEEE 2018 2nd International Conference on Biomedical Engineering (IBIOMED) - Bali, Indonesia (2018.7.24-2018.7.26)] 2018 2nd International Conference on Biomedical Engineering (IBIOMED) - Study of Midfield Wireless Power Transfer for Implantable Medical Devices
摘要： Mid-?eld wireless power transfer (MF-WPT) is a scheme developed for transcutaneous power transfer to micro-implants kept deep inside the body in GHz frequency. With deep seated implants, the possible locations available for application increases to almost the entire body. But, this advantage of applicability is severely limited as the power delivered to the micro implants by MF-WPT is very low -in the range of few 100W. Yet, the mid-?eld operations have higher ef?ciency in miniaturized weakly coupled coil implants compared to traditional near-?eld system. So, with improvement in certain aspects, MF-WPT is expected to play a vital role in biomedical ?eld. For the same reason this paper focuses on analyses of literature available in various aspects of MF-WPT, its challenges, drawbacks and future scope of the scheme in medical ?eld.
关键词： Mid?eld wireless power transfer,Wireless Power Transfer(WPT),Biomedical device
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE International Conference on System, Computation, Automation and Networking (ICSCAN) - Pondicherry, India (2018.7.6-2018.7.7)] 2018 IEEE International Conference on System, Computation, Automation and Networking (ICSCA) - Power Factor Correction in Z-Source Resonant Converter for Wireless Power Transfer Applications
摘要： In this paper the Z-source converter is introduced to power factor correction (PFC) applications. The concept is demonstrated through a wireless power transfer (WPT) system for electric vehicle battery charging, namely Z-source resonant converter (ZSRC). Due to the Z-source network (ZSN), the ZSRC inherently performs PFC and regulate the system output voltage simultaneously, without adding extra semiconductor devices and control circuitry to the conventional WPT system such as conventional PFC converters do. In other words, the ZSN can be categorized as a family of the single stage PFC converters. In addition, the ZSN is suitable for high power applications since it is immune to shoot-through states, which increases reliability and adds a boost feature to the system. The ZSRC-based WPT system operating principle is described and analyzed in this paper. Simulations, and experimental results based on a 1-kW prototype with 20-cm air gap between the system primary and secondary side are presented to validate the analysis, and demonstrate the effectiveness of the ZSN in the PFC of the WPT system.
关键词： Power factor correction (PFC),Wireless Power Transfer (WPT),Total Harmonic Distortion (THD),Z-source resonant converter (ZSRC),Series resonant converter (SRC)
更新于2025-09-10 09:29:36
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A compact omnidirectional dual-circinal rectenna for 2.45?GHz wireless power transfer
摘要： A compact dual-circinal rectenna with omnidirectional characteristic is designed for microwave wireless power transmission at 2.45 GHz. A novel dual-circinal receiving antenna with the reflection coefficient of ?32.5 dB is proposed which is formed by expanding folded curves. By designing an impedance matching network with a 60 (cid:1) radial stub and a single stub, a rectifier is presented with the maximum efficiency of 55.6 % and the output dc voltage of 1.19 V under the input power of 0 dBm. Simulation and measurements have been carried out for the antenna and the rectifier. The measured results agree well with the simulated value. The results of rectenna experiment show that the maximum conversion efficiency is 51% at 2.45 GHz when the input power is 0 dBm. The proposed rectenna has the characteristics of compact size and omnidirectional harvesting which are advantageous in RF energy harvesting applications.
关键词： 2.45 GHz,wireless power transfer,dual-circinal rectenna,omnidirectional,compact
更新于2025-09-10 09:29:36