頁籤選單縮合
題名 | HF Absorption and Static Electromagnetic Properties of NiCuZn Ferrites |
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作者姓名(外文) | Huang, Ching-chien; Hung, Yung-hsiung; Hsu, Jen-yung; Kuo, Ming-feng; | 書刊名 | China Steel Technical Report |
卷期 | 26 2013.12[民102.12] |
頁次 | 頁46-52 |
分類號 | 454.9 |
關鍵詞 | HF; Sinter; NiCuZn ferrite; Absorber sheet; RFID; |
語文 | 英文(English) |
英文摘要 | Using a new and simple blade casting method, sintered NiCuZn ferrite electromagnetic wave absorber sheets, with lighter, thinner and high absorption properties, were first demonstrated. The electromagnetic wave absorption ability was enhanced by sintered NiCuZn ferrite absorbent. The experimental results reveal that NiCuZn ferrite absorber sheets with a thickness 0.1mm have the maximum reflection loss value above 0.74 dB at 11.26 MHz. A corresponding bandwidth of the reflection loss value above 0.3 dB and larger than 1.3 MHz is profitable for wideband electromagnetic wave absorption. The absorption properties could be controlled by the variation of the sintering temperature of the NiCuZn ferrite. A more homogenous microstructure revealed by SEM micrograph and a better crystalline XRD pattern may be responsible for the best absorption ability at 1150oC sintering temperature. The absorption properties were also successfully analyzed in this work, which took into account both the frequency at the reflection loss minimum fr shift correlated with the value of inductance (L) and impedance (Z) of sintered toroidal cores and the power reflection loss (Γ) depending on ε”, μ” and (ε × μ)1/2, where ε and μare complex relative dielectric permittivity and permeability, respectively, for the attenuation material. The sintered NiCuZn ferrite could be a potential candidate as an electromagnetic attenuation material to meet the demand for miniaturization, broader relative bandwidths at HF (3~30 MHz), and beneficial for the fabrication of radio frequency identification (RFID) metal tags. |
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