Communications: directive radio wave systems and devices (e.g. – Radio wave absorber – With particular geometric configuration
Patent
1992-04-24
1994-01-04
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
Radio wave absorber
With particular geometric configuration
342 1, H01Q 1700
Patent
active
052764486
ABSTRACT:
The present invention relates to a broad-band wave absorber wherein beams (3) formed of a ferrite magnetic material are placed at an optimal spacing and are aligned in a lattice form in longitudinal and lateral directions on a conductive plate (2). A magnetic substance of a specific thickness t.sub.m is formed into cylindrical blocks of a height d (where d.gtoreq.t.sub.m) wherein an end surface thereof is polygonal, and the cylindrical blocks are provided with a radio-wave reflecting surface aligned in such a manner that this surface is perpendicular to the axial direction of the blocks, and the end surface of the blocks is approximately perpendicular to a direction from which radio waves are incident. The ferrite magnetic substance could also be formed into rectangular prisms of thickness 2t.sub.m, height d, and length in the longitudinal direction thereof L, with the prisms aligned at a spacing b on a radio-wave reflecting surface, the direction of the height dimension of the prisms being approximately parallel to a radiowave incidence direction, and the surfaces thereof of the dimensions 2t.sub.m and L being perpendicular to the radiowave incidence direction, forming a plane parallel to a magnetic field direction of incident radio waves and the dimension L, wherein the following relationships hold:
REFERENCES:
patent: 3124798 (1964-03-01), Zinke
patent: 4023174 (1977-05-01), Wright
patent: 4118704 (1978-10-01), Ishino et al.
patent: 4973963 (1990-11-01), Kurosawa et al.
Walther, K., "Air Force Technical Report," Absorption and Transmission of Electromagnetic Waves, Phase F, Gottingen, Jul. 1958 pp. 48-54.
Naito Yoshiyuki
Takahashi Michiharu
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