Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Patent
1994-06-06
1999-11-23
Kincaid, Kristine
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
H05K 900
Patent
active
059904178
ABSTRACT:
Electromagnetic noise absorbing material and filter, which are small, light, and effective even with respect to unwanted electromagnetic waves of a few hundred MHz or more, are provided. A small and flexible electromagnetic noise filter cable and tape-shaped electromagnetic noise filter, as well as a manufacturing method and manufacturing apparatus therefor, are also provided. The electromagnetic noise absorbing material has a thickness or particle diameter of the alloy magnetic substance which is within a range of from 1/10 to 10 times the skin depth thereof, and thereby, a large eddy current loss can be generated, so that it is possible to manufacture electromagnetic noise filters having various shapes, which are small, light, and which realize a large electromagnetic noise suppression effect as a result of eddy current loss, and these possess a large relative magnetic permeability even at levels of a few hundred MHz or more. According to the thin film manufacturing method and apparatus, it is possible to easily manufacture an electromagnetic noise absorbing material having small hysteresis, possessing a hard axis of uni-axial magnetic anisotropy, which is superior in high-frequency response, and has a large electromagnetic noise suppression effect.
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"High frequency measurement technique for patterned soft magnetic film permeability with magnetic film/conductor/magnetic film inductance line", Senda et al., Rev. Sci. Instrum., vol. 64, No. 4, pp. 1034-1037, Apr. 1993.
"Application to an EMI Noise Filter of a High-Loss CoZrNb/SiO.sub.2 Multilayer Film", Senda et al., vol. 18, No. 2, pp. 511-514, 1994.
Ishii Osamu
Koshimoto Yasuhiro
Mori Toshinori
Senda Masakatsu
Toshima Tomoyuki
Kincaid Kristine
Ngo Hung V
Nippon Telegraph and Telephone Corporation
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