RADIO WAVE ABSORBER

Title:

RADIO WAVE ABSORBER

Document Type and Number:

Japanese Patent JPH01179399

Kind Code:

A

Abstract:

PURPOSE:To obtain a sheet-shaped thin radio wave absorber which has good characteristics in both vertical incidence and grazing incidence, by a structure wherein strip-shaped radio wave absorber sheets each of which has the specific thickness and length for a wavelength lambda are arranged cyclically in a surface of a dielectric sheet made of a material with relative low loss and buried therein. CONSTITUTION:Strip-shaped high loss sheets 1 (radio wave absorber sheets) are inserted into a low loss sheet 2 (dielectric sheet) and the size of each the strip-shaped high loss sheet 1 is adjusted to the predetermined wavelength, and thereby both wave absorber and wave scattering effects are obtained in the strip-shaped high loss sheets 1. Further, a plurality of the strip-shaped high loss sheets 1 are superposed each other, and thereby in addition to said effects, a multiple reflection effect is obtained among the strip-shaped high loss sheets 1, 1,.... Moreover, medium constants of the strip-shaped high loss sheet 1 and the low loss sheet 2, and thickness of the low loss sheet 2, and inserting positions, shape and arranging method about the strip-shaped sheets 1 are adjusted, respectively, and thereby a radio wave absorber can be provided which has good characteristics in both vertical incidence and grazing incidence. The size factors of the wave absorber are set for a wavelength lambda as follows ; d<0.1lambda in thick ness, 0.1lambdaw in length.

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Inventors:

INUI TETSUJI
HATAKEYAMA KENICHI
YOSHIUCHI AKIRA

Application Number:

JP93988A

Publication Date:

July 17, 1989

Filing Date:

January 05, 1988

Export Citation:

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Assignee:

NEC CORP

International Classes:

H05K9/00; H01Q17/00; (IPC1-7): H01Q17/00; H05K9/00

Attorney, Agent or Firm:

Yoshiyuki Iwasa (3 others)

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