ELECTROMAGNETIC WAVE ABSORPTION SHEET

• Main Authors: FUJITA MASAO, HIROI TOSHIO
• Format: Patent
• Language: English; Japanese
• Published: 24.11.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; INDUCTANCES; MAGNETS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; PRINTED CIRCUITS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS

To realize an electromagnetic wave absorption sheet which can satisfactorily absorb high-frequency electromagnetic waves in a millimeter wave band or higher, has excellent flexibility, and can be easily arranged at a desired portion.SOLUTION: In a reflective electromagnetic wave absorption sheet having an electromagnetic wave absorbing layer and a reflecting layer containing magnetic iron oxide which is an electromagnetic wave absorbing material that magnetically resonates in a frequency band above the millimeter wave band, and a rubber binder, the maximum elongation of an elastic region in one direction in the plane of the electromagnetic wave absorption sheet is 20% to 200%, and an input impedance value when the electromagnetic wave absorption layer is stretched within the elastic region is 360 Ω to 450 Ω.SELECTED DRAWING: Figure 1 【課題】ミリ波帯域以上の高い周波数の電磁波を良好に吸収することができ、かつ、可撓性に優れて所望する部分に容易に配置することができる電磁波吸収シートを実現すること。【解決手段】ミリ波帯域以上の周波数帯域で磁気共鳴する電磁波吸収材料である磁性酸化鉄とゴム製バインダーとを含む電磁波吸収層と反射層を有する反射型の電磁波吸収シートであって、前記電磁波吸収シートの面内の一方向における弾性域の最大伸び率が２０％～２００％であり、前記電磁波吸収層が弾性域の範囲内で引き延ばされた際の入力インピーダンス値が３６０Ω～４５０Ωであることを特徴とする。【選択図】図１