Patent ID: 6304209
Filing Date: 2001-10-16
Classification: H01Q

Abstract:
An electromagnetic wave absorber in broad bands comprising:at least one sintered ferrite magnetic body having lattice bar portions disposed at regular intervals; anda metallic reflection plate to which said at least one sintered ferrite magnetic body is attached;wherein the lattice bar portions comprise sintered ferrite plates of a thickness responsive to a frequency of electromagnetic waves to be absorbed;wherein the sintered ferrite plates are curved so that openings between the lattice bar portions are gradually made narrow from top portions of the sintered ferrite plates to base portions of the sintered ferrite plates, and so that the openings between the lattice bar portions converge to a width almost coincident with the thickness of said sintered ferrite plates; andwherein a dielectric layer is provided in respective spacings between the sintered ferrite plates at said base portions of the sintered ferrite plates outside the openings between the lattice bar portions.