ELECTROMAGNETIC WAVE ABSORBER

摘要

PROBLEM TO BE SOLVED: To make an electromagnetic wave absorbing area to be wide. SOLUTION: In an electromagnetic wave absorbing panel 3, three insulating substrates are arranged in parallel by leaving spaces. A matching film which absorbs a part of an arriving electromagnetic wave, makes the other part reflect and makes the remainder pass through, a division conductive film 22 and a reflection film reflecting the arriving electromagnetic wave are formed on the respective substrates in order from the arriving direction of the electromagnetic wave. A plurality of conductive patterns 24 which have shapes where change patterns whose width (b) changes like bmax→bmin→bmax are repeated at a prescribed period and which have film thickness (a) are disposed by leaving gaps 26 along the width direction. The width (d) of the gap 26 changes like dmin→dmax→dmin. The change ranges bmin to bmax of width (b) and the change ranges dmin to dmax of width (d) are decided in accordance with the frequency bands f1 to f22 of the electromagnetic wave to be absorbed. The electromagnetic wave arrived at the electromagnetic wave absorbing panel is absorbed at a high absorbing rate for the whole frequency bands f1 to f2.