Patent ID: 6165601
Filing Date: 2000-12-26
Classification: H01Q,Y10T

Abstract:
An electromagnetic wave absorber for achieving a damping ratio of at least -20 dB in frequency band between approximately 0.08 GHz and 2.01 GHz, said electromagnetic wave absorber comprising:a metal plate capable of reflecting electromagnetic wave and adapted to be fitted onto a fixed object;a first sintered ferrite plate disposed in front of said metal plate, said first sintered ferrite plate having a thickness of 4.5 mm;a dielectric member disposed in front of said first sintered plate, said dielectric member comprises an air layer and having a low dielectric constant and a thickness of 22 mm; anda second sintered ferrite plate disposed in front of said dielectric member, said second sintered ferrite plate having a thickness of 1.5 mm; andthe first and second sintered ferrite plates each have a magnetic permeablity of approximately 1000 to 2000 at 10 MHz.