Electromagnetic wave absorber and a process of producing same

Details Electromagnetic wave absorber and a process of producing same Electromagnetic wave absorber and a process of producing same

2006-09-26

2006-09-26

Gregory, Bernarr E. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Radio wave absorber

C342S004000

Reexamination Certificate

active

07113123

ABSTRACT:
An electromagnetic wave absorber having an excellent electromagnetic wave absorption characteristic in 5 to 6 GHz band. The electromagnetic wave absorber has a matrix and powder filled in the matrix. The particles of the powder have electrical conductivity at least in surface regions thereof and have a particle diameter of 3 to 20 μm as expressed by D50value. A volumetric ratio (V) in which the powder is filled in the matrix is set such that a standardized value expressed as a value obtained by dividing a complex relative permeability (μ″) of the electromagnetic wave absorber in a frequency band to be absorbed thereby by the volumetric ratio (V) is constant as far as the particle diameter of the powder used, as expressed by the D50value, is within the range of 3 to 20 μm.

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patent: 2003-060383 (2003-02-01), None

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