Patent ID: 6146691
Filing Date: 2000-11-14
Classification: H01Q,H05K,Y10T

Abstract:
A method for electro magnetic wave absorption by a synthetic absorption material, the method comprising the steps of:(a) choosing a frequency band;(b) mixing magnetic metal coated microspheres in a dielectric matrix, the magnetic metal coated microspheres having a magnetic loss, dimensions for the magnetic metal coated microspheres and a 3-dimensional arrangement for the metal coated microspheres being selected so as to provide a desired magnetic permeability within the chosen frequency band;(c) disposing a lower layer of metal coated microspheres in a dielectric matrix upon a supporting surface; and(d) disposing an upper layer of magnetic metal coated microspheres in a dielectric matrix upon said lower layer, wherein said upper layer has a density of the magnetic metal coated microspheres less than the density of the magnetic metal coated microspheres in the dielectric matrix of the lower layer.