Wireless power transmission based on directional coupler and directional filter

Awai, Ikuo; Hori, Kunihito; Yakuno, Shigeo; Kazuki, Namikoshi

doi:10.1109/mwsym.2010.5518186

Cited by 5 publications

(2 citation statements)

References 1 publication

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“…For underwater drone mounting, this is accomplished by changing the landing direction to the charging station using the directional control function of drones. Coupled lines with different feeding positions, such as the interdigital and combline couplers, have been studied in microwave circuit theory and commonly have targeted low-loss dielectrics, such as dielectric substrates [33]- [36]. This paper utilizes those findings to improve the performance of the capacitive coupler in lossy dielectrics.…”

Section: Introductionmentioning

confidence: 99%

Design of a Capacitive Coupler for Underwater Wireless Power Transfer Focused on the Landing Direction of a Drone

NAKA,

TAMURA

2024

IEICE Trans. Electron.

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This paper presents the design of a capacitive coupler for underwater wireless power transfer focused on the landing direction of a drone. The main design feature is the relative position of power feeding/receiving points on the coupler electrodes, which depends on the landing direction of the drone. First, the maximum power transfer efficiencies of coupled lines with different feeding positions are derived in a uniform dielectric environment, such as that realized underwater. As a result, these are formulated by the coupling coefficient of the capacitive coupler, the unloaded qualify factor of dielectrics, and hyperbolic functions with complex propagation constants. The hyperbolic functions vary depending on the relative positions and whether these are identical or opposite couplers, and the efficiencies of each coupler depend on the type of water, such as seawater and tap water. The design method was demonstrated and achieved the highest efficiencies of 95.2%, 91.5%, and 85.3% in tap water at transfer distances of 20, 50, and 100 mm, respectively.

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Section: Introductionmentioning

confidence: 99%

Design of a Capacitive Coupler for Underwater Wireless Power Transfer Focused on the Landing Direction of a Drone

NAKA,

TAMURA

2024

IEICE Trans. Electron.

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“…The lumped-constant equivalent circuit with the parasitic elements represents the characteristic. One study has used a general directional coupler for WPT [7]. We converted the equivalent circuit into the two open-ended directional couplers (i.e., a distributed-constant circuit).…”

Section: Introductionmentioning

confidence: 99%

Representation of an equivalent circuit for capacitive wireless power transfer using a distributed-constant circuit

Naka

Tamura

2020

IEICE ComEX

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Capacitive wireless power transfer is performed using large electrodes or using a medium having high relative permittivity such as water. The transfer efficiency demonstrates a pronounced change with frequency. A lumped-constant equivalent circuit with parasitic elements represents the change. However, a relationship between conditions for generating minimum/maximum values of the transfer efficiency and structural parameters of the electrodes in the coupler has not clarified. In this study, an equivalent circuit is proposed using a distributed-constant circuit. We converted the lumped-constant circuit into two open-ended directional couplers. From the result, we derived the conditions for generating the minimum and maximum values of the voltage input/output ratio. The efficiencies calculated by the distributed-constant circuit and electromagnetic simulation were in good agreement.

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One-dimensional proximity power transmission using ribbon-like waveguide and bar-type high-Q resonant receiver coupler

Noda

Shinoda

2011

2011 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and A

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In this paper we propose a proximity power transmission system using one-dimensional (1D) thin waveguide. In the system the receiver device can extract microwave power from the ribbon waveguide through a bar-type coupler that resonate with high quality factor (high-Q). Due to the high-Q requirement, the system enables selective power transmission to the special receiver and prevents other objects from absorbing power. Due to the narrow geometry, the receiver coupler can be embedded onto the edge of electronic device where embedding a conventional planar coil receiver is difficult. Besides, the node position of the standing wave inside the 1D waveguide can be easily controlled. We demonstrate the power transmission to the thin receiver (8 × 3 × 60 mm 3 ) on the 10-mm wide waveguide can be stabilized regardless to the receiver position by using a reflection phase shifter. The measured transmittance is −10.9 dB. We also fabricated smaller coupler (5 × 2 × 60 mm 3 ) and its rectified output lighted up an LED under 500-mW input into the waveguide.

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Wireless power transmission based on directional coupler and directional filter

Cited by 5 publications

References 1 publication

Design of a Capacitive Coupler for Underwater Wireless Power Transfer Focused on the Landing Direction of a Drone

Design of a Capacitive Coupler for Underwater Wireless Power Transfer Focused on the Landing Direction of a Drone

Representation of an equivalent circuit for capacitive wireless power transfer using a distributed-constant circuit

One-dimensional proximity power transmission using ribbon-like waveguide and bar-type high-Q resonant receiver coupler

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