Quasi-optical analysis of a double reflector microwave antenna system

Pereira, Ricardo A. M.; Carvalho, Nuno Borges; Cunha, J. Pinto da

doi:10.1017/wpt.2017.19

Cited by 20 publications

(4 citation statements)

References 35 publications

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“…The main results of the double-reflector system theoretical analysis 22 , are the relationships between the reflectors’ focal length , f , and the wireless power transfer distance , L : …”

Section: Methodsmentioning

confidence: 99%

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Quasioptics for increasing the beam efficiency of wireless power transfer systems

Pereira

Carvalho

2022

Sci Rep

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The highest beam efficiency in a wireless power transfer (WPT) system that uses focusing components was 51%, using a $$\approx {3}\,{\textrm{m}}$$ ≈ 3 m diameter reflector for a transfer distance of $${7.62}\,{\textrm{m}}$$ 7.62 m . We have beaten that record, and present here a system that surpasses it by 25%. Using the quasioptical framework for reducing spillover losses in WPT, we present a double-reflector system that achieved a higher beam efficiency than the state-of-the-art. The transmitting and receiving antennas were 3D-printed conical smooth-walled horn antennas, specially designed for this purpose. The theoretical analysis enabled the design of a $${5}\,{\textrm{m}}$$ 5 m system, whose energy focus location has been experimentally verified. Then, the complete system was experimented upon, enabling a high beam transfer efficiency of 63.75%. Additionally, the advantage of using quasioptics in radiative wireless power transfer applications is discussed, as well as the sensitivity of its systems. Finally, a comparison with the state-of-the-art is done by the proposal of new figures-of-merit, relating the systems’ physical dimensions and beam efficiency. This research is a paradigm shift by presenting a promising path for future WPT research through quasioptics, whose high efficiencies may enable commercial applications of this technology for solving power supply issues in our society.

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Section: Methodsmentioning

confidence: 99%

“…This simple concept developed into a double-reflector system (Fig. 1 b) that was theoretically analyzed 22 , whose main results are the relationships between the reflectors’ focal length , f , and the wireless power transfer distance , L (Eq. 14 ).…”

Section: Increasing the Beam Efficiency Through Quasiopticsmentioning

confidence: 99%

Quasioptics for increasing the beam efficiency of wireless power transfer systems

Pereira

Carvalho

2022

Sci Rep

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“…To increase it, this work supports itself on the quasioptical (QO) theory [11], which studies EM radiation by comparing it to gaussian beams, taking into account the beam divergence. The authors have experience with this theory as previous work has been developed that used reflectors for focusing beams in WPT systems [12,13].…”

Section: Introductionmentioning

confidence: 99%

Charging Mobile Devices in Indoor Environments

et al. 2022

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Wireless power transfer promises to revolutionize the way in which we use and power mobile devices. However, low transfer efficiencies prevent this technology from seeing wide scale real-world adoption. The aim of this work is to use quasioptics to develop a system composed of a dielectric lens fed by a phased array to reduce spillover losses, increasing the beam efficiency, while working on the antenna system’s Fresnel zone. The DC-RF electronics, digital beamforming and beam-steering by an FPGA, and radiating 4 × 4 microstrip patch phased array have been developed and experimented upon, while the lens has been designed and simulated. This paper details these preliminary results, where the phased array radiation pattern was measured, showing that the beam is being generated and steered as expected, prompting the lens construction for the complete system experimentation.

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“…To do that, this work is based on the quasioptical (QO) theory [10], which studies EM radiation by comparing it to gaussian beams, taking into account the beam divergence. The authors have experience with this theory as previous work has been developed on using reflectors for focusing beams in WPT systems [11,12].…”

Section: Introductionmentioning

confidence: 99%

Charging Mobile Devices in Indoor Environments

Matos¹,

Pereira²,

Ribeiro³

et al. 2022

Preprint

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Wireless power transfer promises to revolutionize the way we use and power mobile devices. However, low transfer efficiencies prevent this technology from seeing wide scale real-world adoption. The aim of this work is to use quasioptics to develop a system composed of a dielectric lens fed by a phased array to reduce spillover losses, increasing the beam efficiency, while working on the antenna system’s Fresnel zone. The DC-RF electronics, digital beamforming and beam-steering by an FPGA, and radiating 4x4 microstrip patch phased array have been developed and experimented upon, while the lens has been designed and simulated. This paper details these preliminary results, where the phased array radiation pattern was measured, showing that the beam is being generated and steered as expected, prompting the lens construction for the complete system experimentation.

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Quasi-optical analysis of a double reflector microwave antenna system

Cited by 20 publications

References 35 publications

Quasioptics for increasing the beam efficiency of wireless power transfer systems

Quasioptics for increasing the beam efficiency of wireless power transfer systems

Charging Mobile Devices in Indoor Environments

Charging Mobile Devices in Indoor Environments

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