ELECTROMAGNETIC WAVE INTERFERENCE ABSORBER, DIELECTRIC LAYER, AND COMPOSITION FOR DIELECTRIC LAYER

• Main Authors: AKAMA HIROSHI, HIRATA TAKASHI, KANEHIRA HIRONORI
• Format: Patent
• Language: English; Japanese
• Published: 07.03.2024
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; ANTENNAS, i.e. RADIO AERIALS; BASIC ELECTRIC ELEMENTS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PRINTED CIRCUITS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

To provide an electromagnetic wave interference absorber which widens a Dip band and has low thermal conductivity.SOLUTION: An electromagnetic wave interference absorber has a dielectric layer containing a resin where a high loss material and a low dielectric material are dispersed, and an electromagnetic wave reflection layer. The dielectric layer has a dielectric constant of 15 or less, relative permeability of 1 or less, a dielectric loss tangent of 0.1 or less and a magnetic tangent of 2 or less. It is preferable that a content of the high loss material in the dielectric layer is 10 vol.% to 40 vol.%, and a content of the low dielectric material in the dielectric layer is 10 vol.% to 40 vol.%.SELECTED DRAWING: Figure 1 【課題】Ｄｉｐ帯域が広帯域化され、熱伝導率が低い電磁波干渉吸収体の提供。【解決手段】高損失材料、及び低誘電材料を分散した樹脂を含む誘電体層と、電磁波反射層と、を有し、前記誘電体層が、１５以下の比誘電率、１以下の比透磁率、０．１以下の誘電正接、及び２以下の磁気正接を有する電磁波干渉吸収体である。前記誘電体層における前記高損失材料の含有量が、１０体積％～４０体積％であり、前記誘電体層における前記低誘電材料の含有量が、１０体積％～４０体積％である態様が好ましい。【選択図】図１