FINE COMPOSITE STRUCTURE MAGNETIC SUBSTANCE ABSORBING GHz BAND RADIO WAVE AND RADIO WAVE ABSORBING M

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PROBLEM TO BE SOLVED : To provide a magnetic substance absorbing electromagnetic wave exhibiting high absorption performance and a wideband specification for a region from several GHz to several tens GHz in order to reduce an electromagnetic interference and health troubles in the frequency band of GHz. SOLUTION : Fine composite structure magnetic substance powder for a GHz band radio wave absorber where fine particles of a magnetic substance principally comprising a metal or an alloy of Fe or Co or a compound of B or N are combined uniformly with fine particles of a rare earth oxide is produced using a melt quenching method. It is then mixed with resin or the like to manufacture a radio wave absorber in the form of a sheet, a board or a cube.