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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AI-Extracted Technical Summary

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 c...

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.

Application Domain

Coaxial cables/analogue cablesInsulated cables +2

Technology Topic

EngineeringElectrical conductor +5

Image

Examples

Experimental program(1)
Effect test(1)

Example

[0068] Example 2

[0069] Under similar conditions as in Example 1, but using 150Al 2 O 3 Chip, film sample 2 is 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 的膜。 The film. The thickness of the film sample 2 is 1.2 μm, the DC characteristic impedance is 2400 μΩ·cm, the anisotropic field strength (Hk) is 120 Oe, and the saturation magnetic field strength (Ms) is 9600 Gauss.

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

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

[0073] The relative bandwidth bwr of the film sample 2 was confirmed to be 181% in a similar manner to Example 1.

PUM

Property	Measurement	Unit
Characteristic impedance	100.0 ~ 700.0	cm·µΩ
Average particle size	1.0 ~ 40.0	nm
Thickness	0.3 ~ 20.0	µm

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