Electromagnetic-wave-absorbing composite sheet
An electromagnetic wave and composite board technology, which is applied in the direction of electrical components, magnetic field/electric field shielding, coating, etc., can solve the problems of not changing the frequency range where the electromagnetic wave noise absorption capacity is maximized, and having no absorption capacity, etc.
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Embodiment 1
[0092] A Ni film 112 having a thickness of 20 nm was formed on a polyethylene terephthalate (PET) film 11 having a thickness of 12 μm by vacuum vapor deposition, thereby preparing a long Ni deposited film. Five test pieces TP of 10 cm x 10 cm were cut out from an arbitrary portion of the Ni deposited film. As shown in Fig. 4, the surface resistance of each test piece TP was measured by the pressurized double-ended method. Each electrode 111 includes an electrode body 111a with a length of 10 cm, a width of 1 cm, and a thickness of 0.5 mm, and an electrode extension 111 b with a width of 1 cm and a thickness of 0.5 mm. The transparent acrylic resin plate 113 is 10 cm x 10 cm x 5 mm, and 3.85 The kg cylindrical weight 114 has a diameter of 10 cm. The two electrodes 111, 111 were connected to a resistance meter (model: 3565) available from Tsuruga Electric Corporation, and the surface resistance was determined from the measured current. The average surface resistance of all tes...
Embodiment 2
[0103] A 25mm x 50mm aluminum foil sheet (thickness: 15 μm) was laminated on each of the 50mm x 50mm electromagnetic wave absorbing films with Ni thin film used in Example 1 by a non-conductive adhesive, so that as shown in Fig. 5(a) One side of the electromagnetic wave absorbing diaphragm shown X 1 and one side of aluminum foil x 2 (parallel to X 1 ) were 0mm, 5mm, 10mm, 15mm, 20mm and 25mm, respectively, to prepare samples 11-16. As shown in Figure 6(a), each sample is placed on the microstrip line MSL on the insulating substrate 300 to measure its noise absorption ratio P in the range of 0.1-6GHz 损耗 / P 入射 . For each sample, distance D, noise absorption ratio P at 2GHz损耗 / P 入射 , the maximum noise absorption ratio P 损耗 / P 入射 and the frequency under the maximum noise absorption ratio are shown in Table 2.
[0104] Table 2
[0105]
[0106] Note: (1) D is the side X of the electromagnetic wave absorbing diaphragm 1 with aluminum foil on one side x 2 the distance b...
Embodiment 3
[0109] Such as Figure 15 As shown, a square aluminum foil sheet with an area ratio of 50% and a square aluminum foil sheet with an area ratio of 50% were laminated to each electromagnetic wave absorbing film having a Ni film with a size of 50mm x 50mm as shown in Example 1 slices so that their centers are aligned to prepare samples 21 and 22. Measure the noise absorption ratio P of each sample 损耗 / P 入射 . Measurement results such as Figure 16(a) and 16(b) shown.
[0110] From Figure 16(a) and 16(b) It can be clearly seen that sample 21 laminated with a square aluminum foil sheet with an area ratio of 50% exhibits a very high noise absorption ratio P compared to sample 22 laminated with a square aluminum foil sheet despite the same area ratio 损耗 / P 入射 . This indicates that the aluminum foil is preferably located at the central portion of the electromagnetic wave absorbing film.
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