Estimation of Effective Permeability for Dumbbell-Shaped Magnetic Cores

Tashiro, Kunihisa; Wakiwaka, Hiroyuki; Hattori, Gen-ya

doi:10.1109/tmag.2014.2359468

Cited by 12 publications

(2 citation statements)

References 10 publications

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“…For the simple winding process and small volume, the single-layer antenna with large N and long winding length l c is often adopted. However, as the magnetic field in the ferrite core is uneven along the axis [13], then, winding along the whole length of the core is not reasonable. Therefore, choosing the appropriate winding length l c is very beneficial to improve the antenna performance.…”

Section: Antenna Coil Designmentioning

confidence: 99%

A long-range passive RFID tag with large ferrite-core antenna for underground detection

Zhu

Guo

et al. 2023

International Conference on Signal Processing, Computer Networks, and Communications (SPCNC 2022)

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This article presents, for the first time, a custom-built passive RFID tag with large ferrite-core antenna for underground detection. Based on the equivalent circuit of tag, the parameters affecting the sensitivity of the ferrite-core tag antenna are studied. Then, through the theoretical analysis of the interactions between these parameters and sensitivity, the design of ferrite core and antenna coil winding are given in detail. Finally, the working distances of the two fabricated ferritecore tag coil antennas are measured with two different reader antennas in a simulated underground environment, and the results show that a detection depth of more than 2 meters can be realized by the presented passive RFID tag with large ferrite-core antenna.

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Section: Antenna Coil Designmentioning

confidence: 99%

A long-range passive RFID tag with large ferrite-core antenna for underground detection

Zhu

Guo

et al. 2023

International Conference on Signal Processing, Computer Networks, and Communications (SPCNC 2022)

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“…The effective permeability listed in Table I was determined by simulation as outlined in [33], using the expression where V core and V air are the induced open-circuit RMS voltages for the given coil and a corresponding air-core coil, respectively.…”

Section: A Magnetic Characteristicsmentioning

confidence: 99%

Magnetic Field Energy Harvesting in Railway

Espe

Haugan

Mathisen

2022

IEEE Trans. Power Electron.

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Magnetic field energy harvesting (MFEH) is a method by which a system can harness an ambient, alternating magnetic field in order to scavenge energy. Presented in this article is a novel application of the concept aimed at the magnetic fields surrounding the rail current in electrified railway. Due to its non-invasive nature, the approach has the potential to be widely deployed as part of low-cost trackside condition monitoring systems in order to increase lifetime and reduce maintenance requirements. In this work, the viability of MFEH in railway is substantiated experimentally-two different configurations are assessed both in a controlled laboratory environment, as well as in situ along Norwegian railway. When placed near an emulated section of railway carrying 200 A in the laboratory, the power output of the system is up to 40.5 mW at 50 Hz and 4.15 mW at 16 2 ⁄3 Hz. In the field, the prototype system harvests 109 mJ from a single freight train passing by, rendering an estimated daily energy output of 1.14 J in a moderately-trafficked location. It is argued that the approach could indeed eliminate the need for battery replacements, and potentially increase the lifetime of an energy-efficient, battery-powered condition monitoring system indefinitely.

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Induction Coil Magnetometers

Tashiro

2016

Smart Sensors, Measurement and Instrumentation

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Estimation of Effective Permeability for Dumbbell-Shaped Magnetic Cores

Cited by 12 publications

References 10 publications

A long-range passive RFID tag with large ferrite-core antenna for underground detection

A long-range passive RFID tag with large ferrite-core antenna for underground detection

Magnetic Field Energy Harvesting in Railway

Induction Coil Magnetometers

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