带通型宽阻带及圆极化频率选择表面技术研究
发布时间：2018-11-23 12:34
【摘要】：频率选择表面(Frequency Selective Surface,FSS)是一种人工电磁周期结构,其频率响应具有特殊的频率选择特性,可以对特定频率的电磁波进行反射或者透射,带内传输/反射损耗小,带宽和谐振频率等指标可控性好。因此,FSS自从问世以来就受到了广泛且持续的关注。虽然FSS的报道文献较多,但是多数集中于对单层FSS形状的研究及小型化实现策略。对于实际具有重要工程应用价值的多层级联FSS的文献报道并不多。此外,在一些新兴的应用中,往往要求FSS有更好的表现,如具有宽带带外抑制的带通型FSS和圆极化波工作方式的FSS,这些研究方向有待进一步探讨。根据现有FSS的发展情况和新的工程应用需求,本文以带通型宽阻带FSS和带通型圆极化FSS为两个基本设计目标,基于等效电路模型方法,对所提出的FSS工作原理和设计方法进行了深入的研究和分析。本文的主要内容安排如下:首先,本文介绍了FSS的研究背景和研究意义。根据FSS的应用场景,对国内外FSS的发展动态进行了分类、梳理。其中,对目前几种热门应用,简要地分析了FSS的工作原理,总结了这些设计中的创新点和不足之处,这为本文的相关研究提供了参照和依据。其次,在分析了传统谐振型单元在宽阻带FSS设计方面的劣势后,本文采用了新颖的非谐振型级联单元作为设计基础,并且合理设计单元中的介质分布,实现了带通型宽阻带FSS的设计目标。此外,文中还分析了非谐振型级联单元多层金属层之间的阵列干涉现象。仿真结果表明,本文设计的带通型宽阻带FSS具有通带插损小、矩形系数高和带外抑制频带宽等优良特性。对于K波段带通型圆极化FSS设计,本文首先理论分析了单层方槽单元的TE和TM极化波响应一致性对入射角和单元几何尺寸的依赖关系。然后,采用双层方槽级联结构,结合等效电路模型优化方法,获得了最终设计结果。在0°~60°入射角域,通带内圆极化波的插损和轴比均小于1dB。并且对这一款FSS进行了加工和测试,测试曲线和仿真结果吻合良好。最后,在线极化带通型宽阻带FSS的基础上,将原始的网栅电感层替换为一种新颖的螺旋曲折线电感层,设计了带通型宽阻带圆极化FSS。通过FSS的等效电路模型进行优化,最终实现了在L/S波段圆极化波的优良传输特性和5~25GHz宽频带范围内的阻带抑制效果。
[Abstract]:Frequency selective surface (Frequency Selective Surface,FSS) is a kind of artificial electromagnetic periodic structure. Its frequency response has special frequency selection characteristics, it can reflect or transmit electromagnetic waves at specific frequency, and the in-band transmission / reflection loss is small. Bandwidth and resonance frequency and other indicators of good controllability. Therefore, FSS has received extensive and continuous attention since its inception. Although there are many reports on FSS, most of them focus on the shape of monolayer FSS and miniaturization strategy. There are few reports on multilayer cascaded FSS with important engineering application value. In addition, in some new applications, FSS is often required to perform better, such as band-pass FSS with broadband out-of-band suppression and FSS, with circular polarization wave. According to the development of the existing FSS and the new engineering application requirements, this paper takes the band-pass wide stopband FSS and the band-pass circularly polarized FSS as the two basic design objectives, based on the equivalent circuit model method. The working principle and design method of FSS are deeply studied and analyzed. The main contents of this paper are as follows: first, this paper introduces the research background and significance of FSS. According to the application scene of FSS, the development trends of FSS at home and abroad are classified and combed. The working principle of FSS is briefly analyzed, and the innovation and deficiency of these designs are summarized, which provides a reference and basis for the relevant research in this paper. Secondly, after analyzing the disadvantages of traditional resonant elements in wide stopband FSS design, a novel non-resonant cascade element is used as the design basis, and the media distribution in the design unit is reasonable. The design goal of band-pass wide stopband FSS is realized. In addition, the array interference between multilayer metal layers of non-resonant cascaded cells is analyzed. The simulation results show that the band-pass wide stopband FSS designed in this paper has the advantages of low bandpass insertion loss, high rectangular coefficient and out-of-band suppression bandwidth. For the design of K-band bandpass circularly polarized FSS, the dependence of the response of TE and TM polarization waves on the incident angle and the geometric size of the element is theoretically analyzed in this paper. Then, the final design results are obtained by adopting the cascade structure of double-layer square groove and combining with the optimization method of equivalent circuit model. In the range of 0 掳~ 60 掳incident angle, the insertion loss and axial ratio of circular polarization wave in the passband are less than 1 dB. The FSS is machined and tested, and the test curve is in good agreement with the simulation results. Finally, on the basis of on-line polarization bandpass wide stopband FSS, the original grid gate inductance layer is replaced by a novel spiral zigzag line inductor layer, and a bandpass wide stopband circularly polarized FSS. is designed. Through the optimization of the equivalent circuit model of FSS, the excellent transmission characteristics of circular polarization wave in L / S band and the effect of stopband suppression in the wide band range of 5~25GHz are realized.
【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】：TN713
[Abstract]:Frequency selective surface (Frequency Selective Surface,FSS) is a kind of artificial electromagnetic periodic structure. Its frequency response has special frequency selection characteristics, it can reflect or transmit electromagnetic waves at specific frequency, and the in-band transmission / reflection loss is small. Bandwidth and resonance frequency and other indicators of good controllability. Therefore, FSS has received extensive and continuous attention since its inception. Although there are many reports on FSS, most of them focus on the shape of monolayer FSS and miniaturization strategy. There are few reports on multilayer cascaded FSS with important engineering application value. In addition, in some new applications, FSS is often required to perform better, such as band-pass FSS with broadband out-of-band suppression and FSS, with circular polarization wave. According to the development of the existing FSS and the new engineering application requirements, this paper takes the band-pass wide stopband FSS and the band-pass circularly polarized FSS as the two basic design objectives, based on the equivalent circuit model method. The working principle and design method of FSS are deeply studied and analyzed. The main contents of this paper are as follows: first, this paper introduces the research background and significance of FSS. According to the application scene of FSS, the development trends of FSS at home and abroad are classified and combed. The working principle of FSS is briefly analyzed, and the innovation and deficiency of these designs are summarized, which provides a reference and basis for the relevant research in this paper. Secondly, after analyzing the disadvantages of traditional resonant elements in wide stopband FSS design, a novel non-resonant cascade element is used as the design basis, and the media distribution in the design unit is reasonable. The design goal of band-pass wide stopband FSS is realized. In addition, the array interference between multilayer metal layers of non-resonant cascaded cells is analyzed. The simulation results show that the band-pass wide stopband FSS designed in this paper has the advantages of low bandpass insertion loss, high rectangular coefficient and out-of-band suppression bandwidth. For the design of K-band bandpass circularly polarized FSS, the dependence of the response of TE and TM polarization waves on the incident angle and the geometric size of the element is theoretically analyzed in this paper. Then, the final design results are obtained by adopting the cascade structure of double-layer square groove and combining with the optimization method of equivalent circuit model. In the range of 0 掳~ 60 掳incident angle, the insertion loss and axial ratio of circular polarization wave in the passband are less than 1 dB. The FSS is machined and tested, and the test curve is in good agreement with the simulation results. Finally, on the basis of on-line polarization bandpass wide stopband FSS, the original grid gate inductance layer is replaced by a novel spiral zigzag line inductor layer, and a bandpass wide stopband circularly polarized FSS. is designed. Through the optimization of the equivalent circuit model of FSS, the excellent transmission characteristics of circular polarization wave in L / S band and the effect of stopband suppression in the wide band range of 5~25GHz are realized.
【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】：TN713
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9 敖s，
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