PURPOSE: To obtain a thin electric wave absorbing material for 2∼4 GHz bands by dispersing the mixture magnetic powder composed by mixing the ferrite powder and the metal iron powder with the fixed range of weight percent into the organic high-molecule material with a fixed ratio.
CONSTITUTION: The mixture magnetic powder is composed by mixing the ferrite powder containing at least one kind of metal selected among the group of Mn, Ni, Mg, zinc, Co and copper with the metal iron powder in the weight percent range of 1:0.2∼7.6. Such magnetic powder is then dispersed into the organic high-molecule material containing the plasticizer, the hardener and the like in the range of the cubic percent of 26∼42 to the whole and then kneaded with the roller, ball mill, sand mill and others to be shaped into the coating form or the sheet form. This electric wave absorbing material is then mounted or coated on the wave reflector in the thickness of 2∼3.8 mm to secure a high reflective attenuation quantity at the 2∼4 GHz bands. This material features the reduced fluctuation of the absorption characteristics to the change of thickness of the material, thus ensuring the excellent coating performance as well as a high ecomonical property.
YAMASHITA HIROSHI
ICHIHARA KENICHI
WATANABE TAKASHI
| JPS5193146A | 1976-08-16 | |||
| JPS4726952A |