Communications: directive radio wave systems and devices (e.g. – Radio wave absorber
Patent
1990-10-15
1992-05-26
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Radio wave absorber
342 4, H01Q 1700
Patent
active
051172291
ABSTRACT:
What is disclosed is a wave absorber comprising an electromagnetic wave absorbing framework having a plurality of cells arranged to define arbitrary shape of U-shaped hollow spaces adapted to the wavelength of the electromagnetic wave to be absorbed, which is prepared by introducing bubbles into an inorganic fluid material, followed by solidification, and an electromagnetic wave absorbing ferrite material applied at least on the walls of the cells defining said U-shaped hollow spaces; wherein the main body of the electromagnetic absorber may have on the surface a weathering-resistant electromagnetic wave transmitting panel comprising a composite of ceramic plate and a Kevlar cloth, glass cloth or other ground fabric or the same inorganic fluid material constituting the wave absorbing framework optionally containing a Kevlar fiber or glass fiber; said wave absorber may be formed to serve also as a building block.
REFERENCES:
patent: 2527918 (1950-10-01), Collard
patent: 2985880 (1961-05-01), McMillan
patent: 3348224 (1967-10-01), McMillan
patent: 3441933 (1969-04-01), Tuinila et al.
patent: 3453620 (1969-07-01), Fleming et al.
Gottlieb Marvin
Hellner Mark
Niioka Yoshio
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