Other

Yoshiyuki Naito

Michiharu Takahashi

Tetsuya Mizumoto

Tetsu Koyama

Kiyomichi Araki

A broad-band radio wave absorber with a plurality of pieces of a magnetic member disposed parallel to each other or in a crosswise way on a reflecting plate. Each of the pieces of the magnetic member is configured in such a manner that its thickness is arranged so as to become smaller from its bottom toward its top in a stepwise fashion and that so as to be longer than its bottom thickness. Further, each of the pieces of the magnetic member is disposed in a relationship spaced away from the adjacent pieces thereof in such a predetermined distance longer than the bottom thickness of each piece thereof.

Broad-band radio wave absorber

The provision of of an electromagnetic wave absorbing apparatus having a broadband electromagnetic wave absorbing characteristic, and which can also be used for the improvement of existing electromagnetic wave absorbing apparatus. Successive layers of an sintered ferrite magnetic body (F), a dielectric body (D) having a low permittivity, and a magnetic body (RF) having a low magnetic permeability, are overlapped on a flat reflector plate, and the relationship between the magnetic permeability .mu.1 of the sintered ferrite magnetic body and the magnetic permeability of the magnetic body having a low magnetic permeability is .mu.1.gtoreq.25.multidot..mu.2.

Broadband wave absorption apparatus

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:

Broad-band wave absorber

An electromagnetic wave absorber containing a mixture of a magnetic material and a carbon material, both in powder form, in a binding medium so as to suspend both kinds of powder particles in space wherein the weight proportions of said binding medium taken as unity, said magnetic material in powder form, and said carbon material in powder form 1:F:C fall within the following limitation ranges:

Electromagnetic wave absorber

A device for preventing electromagnetic wave leakage from gaps between the body of a microwave heating device and the door thereof. The device is configured using an electromagnetic absorber consisting of a mixture obtained by mixing ferrite powder and carbon powder with a soft binder such as rubber so that the device is easily attached on the opening portion of the heating apparatus body or the surface of the door.

Device for preventing electromagnetic wave leakage for use in microwave

A magnetic transmission device using the edge-guided mode of propagation includes a magnetic dielectric slab having a conductor plate member mounted thereon adapted to be magnetized perpendicular to a ground plane on which the slab is placed. The conductor plate member is partially short-circuited to the ground plane.

Growing community of inventors

Kanagawa-ken, Japan

Yoshiyuki Naito