A5071557731- Energy Harvesting in Wireless Networks
- Wireless Power Transfer Systems
- Antenna Design and Analysis
- Microwave Engineering and Waveguides
- Antenna Design and Optimization
- Advanced MIMO Systems Optimization
- Microwave-Assisted Synthesis and Applications
- Full-Duplex Wireless Communications
- Wireless Body Area Networks
- Gyrotron and Vacuum Electronics Research
- Electromagnetic Fields and Biological Effects
- RFID technology advancements
- Advanced Antenna and Metasurface Technologies
- Innovative Energy Harvesting Technologies
- Acoustic Wave Resonator Technologies
- Millimeter-Wave Propagation and Modeling
- Satellite Communication Systems
- Spacecraft Design and Technology
- Microwave and Dielectric Measurement Techniques
- Radio Frequency Integrated Circuit Design
- Metamaterials and Metasurfaces Applications
- Aerospace Engineering and Energy Systems
- Electromagnetic wave absorption materials
- IoT-based Smart Home Systems
- Electromagnetic Compatibility and Measurements
Kyoto University
2016-2025
Kyoto Bunkyo University
2014-2024
Research Institute for Sustainable Humanosphere
2010-2024
Institute of Electrical and Electronics Engineers
2018-2024
United Nations University Institute for Sustainability and Peace
2008-2024
Antea Group (France)
2024
Frontier Science Foundation-Hellas
2024
Long Island University
2024
Alpha Omega Electromagnetics (United States)
2024
Atlantic Industries (Canada)
2024
Wireless power transfer (WPT) has a long history of over 100 years since the first experiment conducted by Nicola Tesla. However, most interesting innovation WPT was born in 21 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">st</sup> century. In this decade, near-field commercialization advanced, and we now use many products, such as wireless chargers for mobile phones electric vehicles. next can expect development far-field via microwaves,...
For a field experiment on microwave power transmission (MPT) which was jointly conducted by the Radio Atmospheric Science Center of Kyoto University, Robe and Kansai Electric Power Company from 1994 to 1995, we had developed tested new type rectenna (rectifying antenna) based circular microstrip antenna (CMA). A square shape array with an area 3.2 m/spl times/3.6 m then constructed using rectennas for experiment. The whole is composed 256 sub-arrays, each nine elements. We place sub-array...
Power beaming is the efficient point-to-point transfer of electrical energy across free space by a directive electromagnetic beam. This paper clarifies basic principles power in simple terms, and proposes benchmarking methodology for improving comparative assessment systems technology. An in-depth historical overview tracing worldwide progress microwave millimeter wave (mmWave) experimental demonstrations over past 60 years shows clear evidence significant increase activity during last 5...
Wireless power transfer (WPT) technology gained wide recognition over a decade ago following resonance coupling WPT study conducted by group at the Massachusetts Institute of Technology (MIT) [1]. was originally proposed Nicola Tesla end 19th century [2] based on near-field inductive-coupling and far-field via radio waves. The first patent involving inductive as wireless charging system granted in 1894 for earliest electric vehicle (EV) [3]. Inductive is transformer commercialized charger an...
Radio frequency (RF) energy harvesting and wireless power transmission (WPT) technologies —both near-field far-field—have attracted significant interest for applications RFID systems. We already utilize WPT products in our life it is expected that RF EH far-field systems can drive the future low-power In this article, we initially present a brief historical overview of these technologies. The main technical challenges rectennas transmitters are discussed. Furthermore, paper presents recent...
This study presents a novel technique to improve axial ratio (AR) of wide-angle scanning phased array. can be applied arrays reconfigurable dual-polarized circular patch antennas: each antenna element has two feeding channels, with separate variable gain amplifier and phase shifter for channel. In the proposed technique, compensation weights, excitation amplitudes phases AR are controlled based on closedform design formula. The formula is obtained by approximately formulating an active...
Wireless power transmission (WPT) is actively being researched and developed. WPT transfers to electrical load without a wire. One of the problems that efficiency easily affected by resistance input power. Therefore, an impedance matching circuit becomes crucial for realization high-efficiency wireless systems. In this study, we proposed maximum point tracking (MPPT) method low-power milliwatt-level RF-dc rectifying using dc-dc converter. We RF-dc-dc consists rectifier measured RF-to-dc...
Recent studies in Japan have focused on the development of wireless power transmission (WPT) systems that are able to charge electric vehicles (EVs). Some WPT inductive coupling, while some been implemented with resonance coupling. There also employ microwaves based traditional research this area. In paper, I review recent progress for EVs Japan.
Impedance matching is a common issue in wireless power transfer (WPT) system. This paper summarizes impedance methods reported the literature and gives theoretical analysis on dc-dc converter for WPT A buck-boost discontinuous conduction mode has characteristic of that input resistance independent load voltage, which seems to be suitable matching. Furthermore, ability will not depend frequency rectifier, because it implements solution dc output rectifier. To verify those, we give several...
Providing energy to Internet of Things (IoT) apparatuses is ever more challenging. Humans are increasingly invested in the revolutionary new scenario that experts call <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Industry 4.0</i> , where billions electronic devices interconnected with one another. The operations battery charging or replacement for these will soon become infeasible. As a consequence, radiative wireless power transfer (WPT)...
Wireless power transmission (WPT) is useful technology in near future. There are some kinds of the WPT technologies, via radio waves, resonance coupling, and inductive. Especially waves used for multi-purposes from short range to long application. However, unfortunately it misunderstood that low efficiency power. In this paper, I show theory beam between transmitting antennas receiving also high efficient applications waves. Especially, pick up a wireless charging system an electric vehicle...
Microwave power transmission (MPT) has had a long history before the more recent movement toward wireless (WPT). MPT can be applied not only to beam-type point-to-point WPT but also an energy harvesting system fed from distributed or broadcasting radio waves. The key technology is use of rectenna, rectifying antenna, convert microwave signal DC with high efficiency. In this paper, various rectennas suitable for are discussed, including circuits, frequency rectennas, and rectennas.
We build a phased array system with four power-variable phase-controlled magnetrons (PCMs) by applying the injection-locking method and phase-locked-loop method. To reduce cost ensure durability of array, waveguide slot antenna was designed used for output PCMs. The has an expected angle deflection 22.5°, gain 24.9 dBi, half bandwidth main lobe 10°. demonstrated properties microwave beamforming wireless power transfer based on magnetron system. In horizontal directions, beam scanning range...
In recent years, microwave wireless power transmission (MWPT) has emerged as a promising technology for supplying energy by receiving radiative without wires and converting it into DC power. A high efficiency is crucial improving the performance of MWPT systems. To address challenge propagation loss, beam synthesis using transmitting antennas gained significant attention, resulting in several methods becoming available, including whisper beams, flat-top non-diffractive...
Using an equivalent-circuit model, frequency-selective surfaces (FSS's) with gridded- and double-square elements have been designed tested for suppressing the harmonics radiation in microwave power transmission system. It is shown that angular sensitivity of frequency response FSS arrays can be reduced a combination TE- TM-polarized incident waves or circularly polarized instead single wave. The also measured anechoic chamber good agreement obtained between theoretical calculations...
Wireless power transmission technology via microwave (microwave ; MPT) was advanced from 1960's and many researchers which had a dream to realize the space solar satellite/station (SPS). In Japan, kinds of SPS were proposed designed in recent ten years. We will show newest Japanese its characteristics. also some results MPT experiments, ubiquitous source, for moving rover, wireless charging system electrical vehicle.
Various wireless power transmissions (WPT) are applied to charge an electric vehicle (EV). An inductive coupling WPT and resonance often used. We proposed a via microwave (microwave transmission; MPT) for the charging of EV. We, Kyoto University, developed two types EV with microwave. One is short distance system which has been from 2003. A transmitter put on road or parking place receiver body This similar WPT. The other mid 2010. There no between receiver. In this paper, we describe merits...
To reduce the weight of a satellite, an internal wireless system (IWS) for satellites was proposed in previous study. It is that can communicate between satellite's subsystems by using communication modules. In this paper, we propose complete IWS satellite microwave power transmission technology. The design 5.8-GHz high efficiency rectifier circuit-based charge pump circuit also presented. Furthermore, introduced class-F load process third harmonic components. rectifying efficiencies normal...
To achieve a high-efficiency microwave wireless power transfer system, high conversion efficiency rectifier is necessary. Brown (1974) designed rectifiers with approximately 3-W input achieved 90% for 2.45 GHz, and it maintains the record maximum efficiency. In this study, to design high-power rectifier, we larger semiconductor metal junction area GaAs Schottky diodes possessing very low series resistance breakdown voltage. addition, built SPICE model package diodes. The 91% at 5-W GHz.
The progression of radio-frequency energy harvesting (RFEH) and wireless power transfer (WPT) has prompted exceptional advancements in rectenna arrays, enabling the transformation electromagnetic (EM) waves into usable power. This comprehensive review article explores state-of-the-art developments array technology, highlighting innovative approaches breakthroughs that have improved efficiency applicability arrays. begins with an explanation fundamental principles underlying operation....
Abstract This paper describes various wireless power transmission (WPT) technologies including inductive coupling, radio waves, and resonance coupling. Theoretically, these three WPT are similar, in that all of them depend on Maxwell's equations. However, there pros cons for each application the WPT. Therefore, a suitable technology must be selected application. Herein, theory, technologies, applications discussed. is useful convenient can employed to charge batteries mobile phones, notebook...