Seiko Instruments Inc

Toppan Printing Co., Ltd.

Moriyoshi Kurosawa

Hiroyuki Tokita

Tsutomu Miyata

Shoji Yokokoji

Masaki Hikida

Tohimasa Hayashi

Yoshiyuki Kitakoga

Yasuo Mizuno

Takashi Sajiki

Yasuharu Nagatomo

An electromagnetic absorbing element is comprised of an elongated rectangular body of dielectric material having a bottom portion attachable to an inner wall of an electromagnetically dark room, and peripheral elongated faces extending vertically from the bottom portion such that a set of the absorbing elements can be arranged in rows-and-columns on the wall. An electroconductive ink film is formed on the peripheral faces of body and has a gradually changing surface resistivity decreasing exponentially lengthwise of the peripheral face toward the bottom portion. The incident electromagnetic wave normal to the wall provided with the rows-and-columns of absorbing elements is absorbed by a lattice of the electroconductive films during the travel along the electroconductive films.

Electromagnetic wave absorbing element

A plurality of waveguide elements are arranged to form an electromagnetic wave absorbing lattice in opposed relation to the advancing wave surface of the incident electromagnetic wave. Each waveguide element has a front opening on the lattice receptive of a part of the incident electromagnetic wave, a rear end portion spaced rearwardly from the front opening, and an inner peripheral surface portion extending between the front opening and the rear end portion to define a cavity effective to wave-guide the received electromagnetic wave. The inner peripheral surface portion has a given electric resistivity to effect absorption of the received electromagnetic wave during the wave-guiding thereof without substantial reflection thereof.

Flat lattice for absorbing electromagnetic wave

Growing community of inventors

Tokyo, Japan

Moriyoshi Kurosawa