覆盖整个UHF频段的吸波结构  

An Absorbing Structure Covering the Whole UHF Band

作　　者：吴昌英[1] 高阳 马承乾 冯富森林 WU Chang-ying;GAO Yang;MA Cheng-qian;FENG Fu-sen-lin(School of Electronics and Information,Northwestern Polytechnical University,Xi’an,Shaanxi 710072,China)

机构地区：[1]西北工业大学电子信息学院,陕西西安710072

出　　处：《电子学报》2024年第2期421-427,共7页Acta Electronica Sinica

摘　　要：设计了一种覆盖整个特高频(Ultra-High Frequency,UHF)频段的超宽带吸波结构.利用了磁性材料的磁导率随频率减小而增大的特性,降低了吸波结构性能对频率的敏感性;结合等效电路方法,引入电损耗,进一步改善了吸波结构的低频性能.在整个UHF频段测量了羰基铁粉的介电常数和磁导率,采用遗传算法优化了等效电路参数,采用全波仿真软件优化了结构参数,在低频端对所加工的吸波结构的反射系数进行了测量.测量结果、仿真结果和等效电路结果吻合良好.所设计的吸波结构的相对带宽超过164%,厚度为最低工作频率波长的2.9%.An ultra-wideband absorbing structure coving the whole ultra-high frequency(UHF)band is provided in this paper.The permeabilities of magnetic materials increase with the decrease of frequency.Therefore,the absorber is less susceptible to frequency.The performance of the absorber at low frequencies is further improved by introducing resistive loss.The permittivity and permeability of carbonyl iron powder are measured by vector network analyzer,the equivalent circuit parameters are optimized by genetic algorithm,and the structure parameters are optimized by full-wave EM simula⁃tor,all in whole UHF band.The absorber is measured at low frequencies.The measured,simulated,and equivalent circuit results show a good agreement.The absorber presents an absorption rate over 90%within a fractional absorption band⁃width over 164%,and it has a thickness of 0.029λat the lowest frequency.

关 键 词：吸波结构 UHF频段 超宽带 羰基铁粉 遗传算法 

分 类 号：TN95[电子电信—信号与信息处理]