RADIO WAVE ABSORBING PANEL

• Main Authors: MATSUMOTO YUJI, TANIGUCHI NAONOBU, TAMAKAI TOSHIYUKI, MORIYAMA YOSHIYUKI
• Format: Patent
• Language: English
• Published: 31.01.2002
• Edition: 7
• Subjects: ANTENNAS, i.e. RADIO AERIALS; BASIC ELECTRIC ELEMENTS; BUILDING; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CEILINGS; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FIXED CONSTRUCTIONS; FLOORS; GENERAL BUILDING CONSTRUCTIONS; INDUCTANCES; INSULATION OR OTHER PROTECTION OF BUILDINGS; MAGNETS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; PRINTED CIRCUITS; ROOFS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; WALLS, e.g. PARTITIONS

PROBLEM TO BE SOLVED: To provide a broadband radio wave absorption band which is targeted not only for a VHF band but also a UHF band under the present circumstances in which adoption of radio wave absorbing walls in a high-rise building has become a common practice as countermeasures against television ghosts. SOLUTION: The radio wave absorbing panel is a radio wave absorbing layered body which consists of a first layer formed of a calcium silicate plate, a second layer formed of a ferrite plate, a third plate formed of a calcium silicate plate, and a fourth layer formed of a metallic reflector. The second layer is formed by providing ferrite plate pieces each having a size of 10 to 25 mm in width (A), 4 to 12 mm in thickness (B), and 200 mm or more in length (C), superposing on each other faces of the pieces each defined by the width and the thickness, so as to be serially arranged in a direction of a magnetic field, and repeating the arrangement of the ferrite plate pieces in a direction of a electric field orthogonal to the magnetic field at the GAP ratio of 45 to 55%.