LAMBDA/4 TYPE RADIO WAVE ABSORBER

• Main Authors: SAWADAISHI, Tetsurou, MUTOU, Katsunori, NAKAO, Sachiko
• Format: Patent
• Language: English; French; German
• Published: 09.02.2022
• Subjects: ANTENNAS, i.e. RADIO AERIALS; BASIC ELECTRIC ELEMENTS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; 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; PERFORMING OPERATIONS; PRINTED CIRCUITS; TRANSPORTING

An object is to provide a λ/4 radio wave absorber that has a higher bending resistance at low temperatures. The object is achieved by a λ/4 radio wave absorber comprising a resistive film, a dielectric layer, and a reflective layer, the dielectric layer having self-repairing properties, the self-repairing properties being defined such that a needle with a diameter of 0.5 mm is vertically inserted into the radio wave absorber from a surface on a side opposite to the reflective layer of the absorber to penetrate through to the rear surface of the radio wave absorber, the needle is removed 10 seconds after penetration, the result is left at room temperature for 7 days, and a value subsequently obtained by subtracting the thickness of the layers other than the dielectric layer and the reflective layer in the radio wave absorber from an average value (average hole depth) obtained by using a color 3D laser microscope (VK8710, produced by Keyence Corporation, or an equivalent product) to measure hole depths in 1000 discretionary points separated from each other by 5 µm on the side on which the holes are opened in the radio wave absorber is less than 4/5 of the thickness of the dielectric layer (or the sum of the thicknesses when the dielectric layer comprises multiple layers).