Low-frequency image theory for a current dipole in front of a permeable sphere

Johan Sten

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Image theory, previously developed for an electric low-frequency dipole in front of a dielectric sphere, is formulated for the magnetically permeable sphere.
The low-frequency image source corresponding to an electric dipole outside the sphere arises only in the case when the orientation of the dipole is perpendicular to the radial direction.
Two alternative image representations are developed. One is a combination of a magnetic strip current and a bifilar magnetic line current, both flowing between the center of the sphere and the Kelvin inversion point on the axis connecting the sphere and the dipole.
The other is a combination of a magnetic strip current and an electric strip current Bowing in orthogonal directions between the center and the inversion point of the sphere. A simple approximation for the image source is also derived
Original languageEnglish
Pages (from-to)954-959
JournalIEEE Transactions on Magnetics
Volume31
Issue number2
DOIs
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed

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abstract = "Image theory, previously developed for an electric low-frequency dipole in front of a dielectric sphere, is formulated for the magnetically permeable sphere. The low-frequency image source corresponding to an electric dipole outside the sphere arises only in the case when the orientation of the dipole is perpendicular to the radial direction. Two alternative image representations are developed. One is a combination of a magnetic strip current and a bifilar magnetic line current, both flowing between the center of the sphere and the Kelvin inversion point on the axis connecting the sphere and the dipole. The other is a combination of a magnetic strip current and an electric strip current Bowing in orthogonal directions between the center and the inversion point of the sphere. A simple approximation for the image source is also derived",
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Low-frequency image theory for a current dipole in front of a permeable sphere. / Sten, Johan.

In: IEEE Transactions on Magnetics, Vol. 31, No. 2, 1995, p. 954-959.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Sten, Johan

PY - 1995

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AB - Image theory, previously developed for an electric low-frequency dipole in front of a dielectric sphere, is formulated for the magnetically permeable sphere. The low-frequency image source corresponding to an electric dipole outside the sphere arises only in the case when the orientation of the dipole is perpendicular to the radial direction. Two alternative image representations are developed. One is a combination of a magnetic strip current and a bifilar magnetic line current, both flowing between the center of the sphere and the Kelvin inversion point on the axis connecting the sphere and the dipole. The other is a combination of a magnetic strip current and an electric strip current Bowing in orthogonal directions between the center and the inversion point of the sphere. A simple approximation for the image source is also derived

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DO - 10.1109/20.364768

M3 - Article

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EP - 959

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

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