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Signal transmission cable with noise absorption high loss magnetic film formed on cable sheath

A technology of signal transmission and high loss, which is applied in the direction of coaxial cable/analog cable, insulated cable, communication cable, etc., and can solve the problems of impracticality, poor magnetic characteristic and frequency characteristic, and high cost

Inactive Publication Date: 2004-12-15
TOKIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this case, the frequency characteristic ("f" characteristic) of its magnetic properties is poor, especially at high frequencies, as in the above case
In addition, although Co-based amorphous materials can be fabricated in the laboratory, the cost is high
Therefore this material is not practical in industry

Method used

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  • Signal transmission cable with noise absorption high loss magnetic film formed on cable sheath
  • Signal transmission cable with noise absorption high loss magnetic film formed on cable sheath
  • Signal transmission cable with noise absorption high loss magnetic film formed on cable sheath

Examples

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example 2

[0069] Under similar conditions to Example 1, but using 150Al 2 o 3 Chip, Film Sample 2 was formed on a glass substrate.

[0070] The obtained film sample 2 was analyzed by fluorescent X-ray spectroscopy, and it was confirmed that the composition was Fe 44 Al 22 o 34 membrane. The film sample 2 has a thickness of 1.2 μm, a DC characteristic impedance of 2400 μΩ·cm, an anisotropic field strength (Hk) of 120 Oe, and a saturation magnetic field strength (Ms) of 9600 Gauss.

[0071] The percentage of the saturation magnetic field strength of film sample 2 to that of metal M itself, expressed as {Ms(M-X-Y) / Ms(M)}, is equal to 44.5%.

[0072] The μ"-f response of membrane sample 2 was obtained in a similar manner to Example 1, shown in Figure 4A . Note that the peak has a high value similar to film sample 1. However, the frequency point of the peak, or the natural resonant frequency, is about 1 GHz, and the complex permeability decreases gradually on both sides of the peak,...

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Abstract

In a signal transmission cable (10) comprising a conductor portion for transmission of signals and an insulator sheath (14) covering the conductor portion, a high loss magnetic film (15) is formed on at least one part of the outer surface of the insulator sheath. The high loss magnetic film has the maximum complex permeability mu'max in a frequency range of 0.1-10 gigahertz (GHz). An example of a magnetic composition of the high loss magnetic film is a M-X-Y magnetic composition comprising M, X and Y, where M is a metallic magnetic material consisting of Fe, Co, and / or Ni, X being element or elements other than M and Y, and Y being F, N, and / or O, said M-X-Y magnetic composition having a concentration of M in the composition so that said M-X-Y magnetic composition has a saturation magnetization of 35-80% of that of the metallic bulk of magnetic material comprising M alone.

Description

technical field [0001] The present invention relates to a signal transmission cable comprising a conductor portion for transmitting electrical signals and an insulator sheath covering the conductor portion, and more particularly to such a cable having a noise absorbing layer for suppressing noise from leaking out of or entering into the cable A signal transmission cable. Background technique [0002] The network transmits electrical signals such as communication signals between electronic devices or between electronic devices, using signal transmission cables such as communication cables. A typical transmission cable generally includes a conductor portion for transmitting signals therein and an outer insulating sheath surrounding the conductor portion. A signal transmission cable of the coaxial type includes a central conductor portion for transmitting signals therein and an outer conductor portion for grounding, an insulating layer inserted between the central conductor po...

Claims

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Application Information

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IPC IPC(8): H01B7/17H01B11/00H01B11/06H01B11/10H01B11/18
CPCH01B11/1083H01B11/00
Inventor 小野裕司栗仓由夫
Owner TOKIN CORP
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