This thesis deals with the design of wireless power transfer at a distance of 600 mm dimensioned to 20 kW. The transfer is provided by inductive coupling of resonant circuits with 800 mm diameter coils. It contains a description of the design and calculations of individual parts, stating specific values. It also includes description and schematics of control circuits.

This Master´s thesis describes different methods of wireless transmitting of energy: electromagnetic induction, electrostatic induction, laser radiation, transfer of energy by microwaves. This thesis is focused on wireless transfer of energy by microwaves. The paper describes the individual parts of the rectenna. Comparison of different types of antennas for use in the rectenna was made. In this thesis is described set of requirements for design of rectenna. Was made design of the rectenna and its simulation.

<p>Beam-powered aircraft are a promising solution to reducing the air transportation system's operating costs and emissions due to their reliance on typically more efficient ground-based electricity sources.</p> <p>However, modeling these aircraft is a non-trivial task due to their multi-disciplinary nature and the required interconnectedness between the aircraft, air transportation network, and power-beaming models.</p> <p><br></p> <p>This thesis establishes a methodology for holistically modeling beam-powered aircraft as a freight transportation asset in the context of their operating environment.</p> <p>This methodology accounts for elements of aircraft conceptual design, the limits of power-beaming technology, and non-idealities associated with the air transportation network.</p> <p>As a product of this methodology, this thesis also approximates beam-powered aircraft's economic and environmental feasibility based on current and future technological capabilities.</p> <p><br></p> <p>This work concludes that with an optimistic enough "engine absent" mass fraction and with sufficiently advanced technologies -- particularly with higher power density rectennas -- beam-powered aircraft are both economically and environmentally feasible, having a lower operating cost and emitting less carbon dioxide per ton-mile compared to current-day and near-future freight transportation aircraft.</p> <p><br></p> <p>More specifically, this work concludes that when using a simplified and more optimistic engine absent mass fraction model, power train specific power only needs to improve by a factor of 1.2-3.7 and rectenna power density only needs to improve by a factor of 20-30 compared to the baseline technologies considered in this work in order for beam-powered aircraft to be a feasible alternative to jet fuel powered aircraft in a freight transportation role.</p> <p>However, with a more pessimistic albeit more realistic engine absent mass fraction model, this work concludes that beam-powered aircraft are not feasible in a freight transportation role with the technology levels considered in this work.</p>

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Kyoto University (京都大学) / 0048 / 新制・課程博士 / 博士(工学) / 甲第18992号 / 工博第4034号 / 新制||工||1621 / 31943 / 京都大学大学院工学研究科電気工学専攻 / (主査)教授 篠原 真毅, 教授 和田 修己, 教授 山川 宏 / 学位規則第4条第1項該当

京都大学 / 0048 / 新制・課程博士 / 博士(工学) / 甲第18992号 / 工博第4034号 / 新制||工||1621(附属図書館) / 31943 / 京都大学大学院工学研究科電気工学専攻 / (主査)教授 篠原 真毅, 教授 和田 修己, 教授 山川 宏 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DFAM

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Indiana University-Purdue University Indianapolis (IUPUI) / This thesis proposes a reconfigurable phased array of antennas for wireless power transfer. The array finds use in many applications, from drone destruction (for defense) to wireless charging of robots and mobile devices. It utilizes a novel feeding architecture to greatly reduce the number of high cost elements (such as amplifiers and phase shifters) as well as the quantity of unused resources in the system. Upon the instruction of the CPU, the array can separate into any number of subarrays, each of which transmits power to a single receiver, steering its beam as the receiver changes location. Currently dormant elements in the array can be used to provide position information about the receivers, either via Radar, or by listening for beacons pulses from the receiver. All of this is made possible, with only 4 amplifiers and 3 phase shifters, by the proposed 4-Bus Method. The source signal is divided into four buses, which are respectively phase shifted by 270 degrees, 180 degrees, 90 degrees, and 0 degrees (no shifter required) and then amplified. The CPU calculates, based on the number and positions of the receivers / targets, what the amplitude and phase excitation must be at each element. Any phase and amplitude which could be required can be achieved by simply adding together appropriate quantities of the correct two buses. In order to achieve this, the key piece is the variable power divider. These differ from Wilkinson dividers in that the dividing ratio can be changed via an applied DC voltage. Therefore, at each junction, by properly diverting the power levels on each phase bus to their proper location, complete delocalization of both amplifiers and phase shifters can be achieved. A method has also been developed which helps overcome the limitations of each variable power divider. That is, in certain instances, it may be desirable to pass all the power to a single output port or the other, which is not a possibility inherently possible with the device. With the use of a unique combination of RF switches, the nodes achieve much enhanced flexibility. Finally, an intensive study is carried out, in an attempt to yield greater understanding, as well as quick, useful approximations, of the behaviors of both rectangular and hexagonal arrays of various sizes and beam steering angles for wireless power.

[pt] Muitos drones subaquáticos (DSs) modernos usados no monitoramento militar e ambiental operam no oceano e são concebidos como transceptores intermediários entre sua estação base (EB) e redes de sensores sem fio subaquáticas (RSSFSs). Devido a salinidade e consequentemente a condutividade da água do mar, DSs não podem usar transmissões de rádio frequência (RF) convencionais, tanto para alimentar quanto para se comunicar com os nós sensores (NSs). Tentando superar essas limitações, sistemas de transmissão indutiva de energia (TIE) têm sido apontados como uma alternativa para RSSFSs assistidas por DSs confiáveis. TIE apresenta perdas menores do que técnicas de campo distante em meios complexos, mas é extremamente limitada em termos de distância de operação. Baseado nisso, a presente tese visa uma solução mais integrada para sistemas de monitoramento assistidos por DSs baseado em sistemas de TIE usando lentes e refletores de metamaterial (MTM) dedicados a aprimorar ambas a eficiência na transmissão de energia e a razão sinal-ruído dos dados transmitidos. Um novo modelo do canal magnético, baseado no modelo de linhas de transmissão magnéticas virtuais, incorporando os ganhos dos MTMs e as perdas da água do mar, também é apresentado de modo a facilitar a futura sistematização das RSSFSs. / [en] Most modern underwater drones (UDs) employed in military and environmental monitoring operate in the ocean and are conceived as intermediary transceivers between their base station (BS) and underwater wireless sensor networks (UWSNs). Due to the salinity and consequently the conductivity of seawater, UDs cannot use conventional radiofrequency (RF) transmissions, either for powering or communicating with the sensor nodes (SNs). Trying to overcome these limitations, inductive power transmission (IPT) systems have been pointed out as an alternative for reliable UD-assisted UWSNs. IPT presents lower losses than far-field-based techniques in complex media but is extremely limited in terms of operating distance. Based on that, the present thesis aims an all-integrated solution for UD-assisted monitoring systems based on IPT systems using metamaterial (MTM) lenses and reflectors dedicated to improving both the power transfer efficiency and the signal-noise ratio of the transmitted data. A new model of the magnetic channel, based on the virtual magnetic transmission line model, incorporating the MTM gains and the seawater losses, is also presented in order to facilitate the future systematization of UWSNs.