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This paper proposes a distributed reactance compensation technique, which is a useful approach for reduction of dielectric loss in a substrate of printed spiral coils. Distribution of lumped capacitors between coil windings reduces voltage fluctuations, and thus the strength of electric field, finally yielding lower dielectric loss. The usefulness of the proposed technique was verified by both simulation...
The transfer efficiency of a resonant wireless power transfer system highly depends on the load impedance and the reactance of the resonators. In many practical applications, these parameters fluctuate by the variation of operating conditions. Therefore, adaptive impedance tuning methods are necessary in order to continuously achieve high-efficiency power transfer. To provide a countermeasure to this...
In order to extend the transfer distance in wireless power transfers using magnetic resonant coupling, it is necessary to increase the quality factor of resonators. In general, resonators with a larger number of turns may have a higher quality factor; however, the number of turns is limited by the half wavelength. To overcome this frequency limitation, we propose a multiple-half-wave resonator that...
A magnetic resonance wireless power transfer (WPT) system using a 2D relay resonator array has been proposed. To make practical use of this system, the powering paths to the receiver devices need to be created automatically. This paper presents a receiver localization method suitable for the 2D WPT system. The feasibility of this method is evaluated by both simulation and experimentation. Moreover,...
Resonator design methods play an important role in realizing efficient wireless power transfer via magnetic resonant coupling (WPT-MRC) systems. In WPT-MRC systems, transmitting (Tx) resonator arrays are often used to extend the range of the power supply. However, it is difficult to design a receiving (Rx) resonator that prevents significant drops in transfer efficiency across the Tx resonator array...
Antenna designs using evolutionary computation methods have been widely used because of the rapid development of wireless technologies. However, a large number of antennas must be analyzed when evolutionary computation methods are adopted. Running a simulation is the main method of obtaining information about an antenna, such as bandwidth and input impedance, but it is very time-consuming because...
In wireless power transfer (WPT) systems, changes in the receiver position and load resistance affect the output voltage and power efficiency. A receiver-side switching voltage regulator is useful for output voltage regulation, but it cannot be utilized with a DC-DC converter dedicated to conventional maximum efficiency point tracking (MEPT). As an MEPT method compatible with a switching voltage regulator...
Wireless power transmission using magnetic resonant coupling has attracted considerable attention as a key technology to realize high efficiency in mid-range transmission. Suppressing unwanted electromagnetic radiation is an important criterion in terms of electromagnetic compatibility. This paper proposes a new resonator design to suppress electromagnetic leakage based on a loop-antenna analysis...
Wireless power transmission (WPT) via electromagnetic resonance has been focused on by researchers in related fields. Also, a multi-hop wireless power transmission system successfully extends power transmission distance by using multiple resonators. Sending data along with electrical power is one of the most important but missing pieces for the realization of the multi-hop WPT system. Different from...
Wireless power transmission using magnetic resonance is considered a key technique for cutting the last wire to electrical devices in indoor environments. We realize this concept by using multi-hop displacement of a magnetic resonator array. However, multi-hop displacement has been impractical because of the complexity of the impedance matching procedure. In this study, we have derived a simple but...
In this paper, we introduce two different approaches for the virtualization of power cords for electrical devices. The first approach is a new concept for routing electric power by wireless transfer on two-dimensional surfaces, such as floors and walls. Unlike any other existing wireless power transfer scheme, this method can deliver electric power over a wide range with minimal loss. We realize this...
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