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, synthetic resin layered products, etc., can solve the problems of no absorption ability, no electromagnetic wave noise absorption ability, frequency range conversion, etc.
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Embodiment 1
[0072] Each electromagnetic wave absorbing magnetic diaphragm 1 of 50 mm x 50 mm cut from a commercially available noise absorbing plate (NOISEFUSEGU 10S, WW-GM10-S, available from Wide Work Corporation, thickness: 1 mm) was combined with a size L (10 mm, 20 mm , 25 mm, 30 mm, 40 mm and 50 mm) x 50 mm each of aluminum foil sheets (thickness: 15 μm) 2 were laminated by a non-conductive adhesive to prepare samples 1-6. In each sample, the center of the aluminum foil 2 was aligned with the center of the electromagnetic wave absorbing magnetic film 1 .
[0073] Using the system shown in Figure 4(a) and 4(b), the system includes a 50Ω microstrip line MSL (64.4mm x 4.4mm), an insulating substrate 300 supporting the microstrip line MSL, attached to the insulating substrate 300 The ground electrode 301 on the lower surface of the microstrip line MSL, the wire pins 302, 302 connected to the two ends of the microstrip line MSL, the network analyzer NA, and the coaxial cables 303, 303 co...
Embodiment 2
[0081] A 25mm x 50mm aluminum foil (thickness: 15 μm) was laminated on the 50mm x 50mm electromagnetic wave absorbing magnetic diaphragm used in Example 1 by a non-conductive adhesive, so that the electromagnetic wave absorbing magnetic film as shown in Figure 3 (a) Diaphragm side X 1 with aluminum foil on one side X 2 (parallel to X 1 ) between 0mm, 5mm, 10mm, 15mm and 20mm to prepare samples 11-15. Such as Figure 5 As shown, 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 . The results are shown in Figure 12-16 middle. And, for each sample, measure the distance D, the noise absorption ratio P at 2 GHz 损耗 / P 入射 , the maximum noise absorption ratio P 损耗 / P 入射 and the frequency at which the noise absorption ratio is maximum. The results are shown in Table 2.
[0082] Table 2
[0083]
[0084] Note: (1) D represents the side X of the electromagnetic wave ...
Embodiment 3
[0087] Such as Figure 17 As shown, the square aluminum foil sheet with an area ratio of 50% and the square aluminum foil sheet with an area ratio of 50% are laminated on the same 50mm x 50mm electromagnetic wave absorbing magnetic diaphragm as in Example 1, so that their center Samples 21 and 22 were prepared in alignment. Measure the noise absorption ratio P of each sample 损耗 / P 入射 . The measurement results are shown in Figure 18(a) with 18(b) middle.
[0088] from Figure 18(a) with 18(b) It can be seen that although the area ratio is the same, the sample 21 laminated with the square aluminum foil sheet with an area ratio of 50% exhibits a much higher noise absorption ratio P than the sample 22 laminated with the square aluminum foil sheet 损耗 / P 入射 . This shows that the aluminum foil is preferably located at the central portion of the electromagnetic wave absorbing magnetic diaphragm.
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