论文部分内容阅读
采用溶胶凝胶法制备了平面六角铁氧体,并用扫描电镜(SEM),X射线衍射仪(XRD)对它的形貌以及相结构进行了表征,用矢量网络分析仪(VAZ)研究了不同比例的Ni/铁氧体混合物的微波吸收性能。结果发现,随着混合物中的平面六角铁氧体含量增多,混合物的微波吸波吸收峰向高频方向移动,当混合物由20%Ni+80%铁氧体组成时,混合物的微波吸收性能最佳。当吸波涂层厚度为2 mm时,在12 GHz处,最小反射率为–20 d B,小于–10 d B的带宽达到了4 GHz。当吸波涂层厚度增加时,吸收峰频率向低频移动,吸收峰值先变小,后增大。当厚度达到一定值时,混合物在2~18 GHz之间出现2个吸收峰,这对于研究宽频吸收具有重要意义。
The hexagonal ferrite was prepared by sol-gel method. Its morphology and phase structure were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) Microwave Absorption Properties of Proportional Ni / Ferrite Mixtures. As a result, it was found that as the content of the planar hexagonal ferrite in the mixture increased, the microwave absorbing absorption peak of the mixture shifted in the high frequency direction. When the mixture consisted of 20% Ni + 80% ferrite, the microwave absorbing property of the mixture good. With a wave-absorbing coating thickness of 2 mm, the minimum reflectance is -20 dB at 12 GHz and 4 GHz with frequencies less than -10 dB. When the absorbing coating thickness increases, the absorption peak frequency to low frequency, the absorption peak first smaller, then increased. When the thickness reaches a certain value, the mixture exhibits two absorption peaks between 2 and 18 GHz, which is of great significance for the study of broadband absorption.