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A cheap radio Absorbing Materials

Measuring the absorption of wave absorption coating changes with frequency, and then coated grinding to 0.65mm, measuring the absorption varies with frequency, and the results shown in Figure 4. The figure shows (I),[link widoczny dla zalogowanych], revolves around using polyurethane binders for wave absorption coating of crude iron ore, with the thickness increases, the absorption also increases the scope of the test coating thickness, the thickness is almost double the increase in absorption t doubled the thickness is not clear that the thicker the better, the existence of such a match the same absorbent material thickness t (separate report). (2) match the absorption curve shape and position of the frequency unchanged,[link widoczny dla zalogowanych], indicating that the coating thickness was no significant relationship with frequency. \Figure 5 Hexaferrite convex line joining absorption of iron ore of Fig5Theinfluenceofthemixingofhexagonsys-temferriteupontheironsandabsorption (a) by adding fine iron ore in the hexagonal ferrite (b) addition of crude iron ore plus a bouquet of flowers hexagonal ferrites a 2-4 corner ferrite increase the amount of creep increases which hit angle ferrite Figure (a) for the fine fine iron ore, (b) for the coarse and fine iron ore. Can be seen from the figure the following: (1) Each sample has two peaks corresponding to the peak frequency in the 8.6GHz and 10. . GHz or so, indicating that hexagonal ferrite material effect on the addition of iron ore on the radio beam absorption peak position. (2) hexagonal ferrite materials in both joined the coarse and fine iron ore fine iron ore is still small, with the additive increases, the gradual absorption of the small base, while the absorption curve corresponding to the gradual increase in the bandwidth, \.28 (4 W, which is more obvious on the fine iron ore. 4 Conclusion (1) wave absorption material in the construction industry has a wide range of applications], in order to improve the electromagnetic environment of high-rise building damage, and research often spit with electromagnetic wave absorption function New Ferrite building materials have become very important, the current general use in the construction of the ferrite EM wave absorption material ashamed, mainly specializes in the production of spinel ferrite such materials, the cost per ton to a few thousand or even million, due to large amount of the construction industry, cost reduction is very important iron ore is a natural spinel ferrite, and its rich reserves, processing technology is simple, inexpensive, into a rate of less than a thousand per ton element, so that it is an ideal electrical construction crossing the absorption material. from the current research perspective,[link widoczny dla zalogowanych], a single iron ore absorbed Front | material in 7 ~ 12GHz range, absorption is greater than 3dB, up to 12dB, if;! Chu was the best thickness, adding a certain amount of different dielectric and magnetic loss of quality flowers, there will be a larger increase in absorption. (2) 7 ~ 12GHz band, iron ore on the radio there are two absorption peaks, which Naito found that each ferrite absorbing wall there are two single-matching frequency is the same, he would find a resonance relaxation I bow, the second mechanism is not clear. Of particular interest is added in the iron ore hex Ferrite, can change the amount of width, absorption, and also enable a shift to low frequency peak, which is the mechanism of absorption is significant. The test form is only to play, specially processed iron ore on the radio has a larger absorption characteristics, the mechanism of absorption of electromagnetic losses caused by the ferrite, and iron ore or trace impurities contained in the relevant elements, to be studied. as a coating, binder selection,[link widoczny dla zalogowanych], matching thickness of drain layer is also very important. In short, this study only the beginning, many issues need further study. Reference Zhang orange. Magnetic Materials and Devices .1995.26 (1): 26AiyarRta1.PorcICF a 5,1989.955 ~ 96OVjnaandBanthiaAKPorcTCF a 5. ] 989 995 ~ 999 von the port, Huahui. \Magnetic Specialty, after the Department of Education in the school for two years magnetism. 1963 Department of Physics,[link widoczny dla zalogowanych], Anhui University of magnetism and magnetic materials in teaching and research is currently Professor of Physics, Anhui University, Modern Physics Laboratory. 1978 completed a total of nine major research projects at the provincial level. The \, the provincial Science and Technology Award of the two more than 60 papers published in 1992, the State Council special allowance. 385

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