频率选择表面技术及在天线罩设计方面的应用

发布时间：2018-05-14 00:39

本文选题：双带频率选择表面 + 方环　；参考：《电子科技大学》2017年硕士论文

【摘要】：由于在军事和航空领域独到的性能和应用,频率选择表面从2000年以来逐渐成为研究人员的集中研究课题。频率选择表面(FSS)类似于空间微波滤波器,在周期单元尺寸对应的谐振频率一定带宽内分别表现出反射和传输的特性形成滤波的效果。设计多频带、基于立体结构和微型化FSS是国内外专家近几年来的研究趋势。首先总结对频率选择表面常用的有效计算方法,采用等效电路法对典型结构形状的频率选择表面进行理论分析,据此得到等效电路模型,从理论上计算出结构单元参数和频率选择表面特性的关系,并采用MATLAB计算与全波数值计算结果比较验证。其次提出基于十字加载和方环的双频稳定结构单元,并研究了所构成的FSS电特性,包括分析平面波垂直入射时的透射响应曲线、比较改变入射角时曲线变化结果等。通过分析和实验测试结果均说明入射角稳定性一致,在?60?内FSS表现出良好选择性和斜入射稳定性。利用FSS天线罩与圆极化天线一体化设计侧面证实了对圆极化波的不敏感性。进一步探讨所提出的双频选择结构的两方面应用,一个是利用其互补形式的电阻型FSS用于展宽吸波体带宽的分析,在FSS稳定的双频透波的基础上,所设计的吸波体比利用传统结构研究的更薄,总厚度小于3.6毫米,展宽了传统结构吸收体带宽。最后设计新型频率选择天线罩并使用在雷达散射截面(RCS)缩减领域。FSS天线罩既保证了天线稳定的工作环境免受外部干扰又能够降低一定范围内带外RCS,建立理想的天线和天线罩整系统模型,通过偶极子天线确定曲面天线罩的工作频率,讨论FSS天线罩对共形天线阵的参数影响。重点研究共形柱面天线阵在有无柱面天线罩时方向图的比较。值得指出FSS天线罩使天线阵性能改变微小,同时带外RCS在特定方向缩减效果可达10d B之多。以上研究表明基于此新型结构的FSS具有优良的电磁特性,易于应用到设计吸波体和FSS天线罩中。
[Abstract]:Because of its unique performance and application in the field of military and aviation, frequency selective surface has gradually become a focus of research for researchers since 2000. Frequency selective surface (FSS) is similar to a spatial microwave filter, showing the characteristics of reflection and transmission in a certain bandwidth corresponding to the resonant frequency of the periodic unit size to form a filter. The effect of designing multi band, based on stereoscopic structure and miniaturized FSS is the research trend of experts at home and abroad in recent years. Firstly, it summarizes the effective calculation methods commonly used for frequency selective surfaces. The equivalent circuit method is used to analyze the frequency selection surface of typical structural shapes, and the equivalent circuit model is obtained and calculated theoretically. The relationship between the parameters of the structural unit and the selection of the surface characteristics of the frequency is obtained. The MATLAB calculation is compared with the results of the full wave numerical calculation. Secondly, a double frequency stable structural unit based on the cross loading and the square ring is proposed, and the FSS electrical characteristics are studied, including the transmission response curve of the plane wave, which is analyzed to change the incidence of the incident. The results of angular curve change, etc., show that the incident angle stability is consistent with the results of analysis and experimental test, which shows good selectivity and oblique incidence stability at? 60? FSS. The insensitivity to circular polarization is confirmed by the integration of FSS radome and circular polarized antenna. The proposed dual frequency selection structure is further explored. Two applications, one is to use its complementary form of resistance type FSS to broaden the bandwidth of the absorber. On the basis of FSS stable double frequency wave, the designed absorber is thinner than the traditional structure, and the total thickness is less than 3.6 millimeters, broadening the bandwidth of the traditional structure absorption body. Finally, a new type of frequency selection radome is designed. The.FSS radome in the field of radar cross section (RCS) reduction is used to ensure that the working environment of the antenna is stable from external interference and can reduce the outer RCS in a certain range. The ideal antenna and radome system model is established. The working frequency of the surface radome is determined by the dipole antenna, and the conformal antenna of the FSS radome is discussed. It is worth to point out that the FSS radome makes the antenna array performance small and that the effect of RCS in the specific direction can be reduced to 10d B at the same time. The above research shows that the FSS based on this new structure has excellent electromagnetic characteristics and is easy to apply. To design the absorber and the FSS radome.

【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN820.81

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