Basic Study of Both-Sides Retrodirective System for Minimizing the Leak Energy in Microwave Power Transmission

Matsumuro, Takayuki; Ishikawa, Yoshihiro; Shinohara, Naoki

doi:10.1587/transele.2019mmp0011

Cited by 11 publications

(3 citation statements)

References 18 publications

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“…Recently in Japan, a new retrodirective method has been proposed for more effective narrow-beam WPT. It was named the bothsides retrodirective system for minimizing the leak energy [35]. In the conventional hardware retrodirective system, the phase conjugate circuits were adapted only at the transmitting array antenna, and the beacon signal from a target usually becomes a plane wave after propagation to the transmitting antenna.…”

Section: B Key Technology Of Narrow-beam Wpt: Beam Formingmentioning

confidence: 99%

History and Innovation of Wireless Power Transfer via Microwaves

Shinohara

2021

IEEE J. Microw.

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110

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Wireless power transfer (WPT) has a long history of over 100 years since the first experiment conducted by Nicola Tesla. However, the most interesting innovation of WPT was born in the 21 st century. In this decade, near-field WPT commercialization was advanced, and we now use many near-field WPT products, such as wireless chargers for mobile phones and electric vehicles. In the next decade, we can expect the development of far-field WPT via microwaves, through which we can drive Internet of Things (IoT) sensors without batteries based on transmitted or ambient microwave power. We can charge mobile phones with microwave power. When we focus microwave power on a target by beam forming technology, we can transmit higher wireless power to fly drones or from space to the earth. In conjunction with the research & development of microwave-based WPT, radio regulations suitable for each country need to be discussed. In this paper, I review the history, innovation, and status of the radio regulations of WPT via microwaves with the classification of wide-beam WPT, including harvesting, and narrow-beam WPT.INDEX TERMS Wireless power transfer, microwave power transfer, far-field WPT, beam forming.

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Section: B Key Technology Of Narrow-beam Wpt: Beam Formingmentioning

confidence: 99%

History and Innovation of Wireless Power Transfer via Microwaves

Shinohara

2021

IEEE J. Microw.

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110

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“…For power beaming with high intensity, the beam forming is most important to reduce spillover power, not only from the viewpoint of transmission efficiency, but also from the viewpoint of radio interference. Research was conducted on the aperture distribution to maximize transmission efficiency [14] and on low-leakage beamforming based on Gaussian beams [15], [16]. Design of power amplifiers [17] and simplification of power feeding circuits [18] during sidelobe reduction was also proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Some of the authors previously proposed a both-side retrodirective system to dynamically minimize spillover in real-world situations [21], [22]. Retrodirective systems typically re-radiate power signals in the direction of arrival by inputting the received pilot signals into the phase conjugate circuit of each antenna element [23], [24].…”

Section: Introductionmentioning

confidence: 99%

A Study on Evaluation Method for Beam Profile of Phased Array by Using Two-Dimensional Measurement Equipment

Yukawa

Matsumuro²,

Ishizaki

et al. 2023

IEICE Trans. Electron.

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Recently, "Both-Side Retrodirective System" was proposed, as a beam convergence technique, for microwave high power transmission. To demonstrate the effectiveness of the both-side retrodirective system by experiment, the authors propose a 2-dimensional measurement equipment. Propagation in the parallel plate waveguide was analogized based on free-space propagation, and the theory and characteristics were clarified by simulation. The electric field distribution in the waveguide was measured by electric probe with the proposed equipment. Two types of measurement equipment were developed. One is a 4-element experiment system, which is a small-scale device for principle verification. The other is a 16-element measurement equipment, which is intended to evaluate beam convergence of a both-side retrodirective system in the next step. The measured results were compared with simulation results. As a result, it was confirmed that the beam formed in the waveguide was successfully measured. Thus, the effectiveness of 2-dimensional measurement equipment for evaluation of beam convergence was shown.

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