摘要电磁带隙(EBG)结构具有明显的电磁特性,包括他们的反射相位随频率的变化。本文应用这种独特的反射相位特性来改变雷达目标的散射场方向,以减少雷达散射截面。具体的研究内容包括:73264
1。设计了两种电磁带隙结构单元,并应用Ansoft HFSS软件对它们的反射相位以及反射系数进行仿真。
2。应用两种电磁带隙结构单元组成不同元素个数的正方形棋盘表面,并选择合适元素个数的棋盘表面研究它的雷达散射截面特性。同时研究了入射波方向,基底介电常数,棋盘面尺寸对雷达散射截面的影响。
3。设计了一种正六边形和正八边形棋盘面电磁带隙结构,研究在法线入射和斜入射情况下,其雷达散射截面特性。
毕业论文关键词 雷达散射截面 减缩 电磁带隙结构
毕业设计说明书外文摘要
Title Research of Electromagnetic Band Gap for Broadband Radar Cross Section Reduction
Abstract Electromagnetic band-gap (EBG) structures have noteworthy electromagnetic characteristics that include their reflection phase variations with frequency。 This paper applies this unique reflection phase property to alter the direction of the fields scattered by a radar target to reduce its radar cross section (RCS)。 Specific research contents include:
1。 Two kinds of electromagnetic band-gap structures are designed, and their reflection phase and reflection coefficients are simulated by HFSS Ansoft software。
2。 Two kinds of electromagnetic band gap structures are used to form a square checkerboard with different elements, and the surface of the checkerboard is chosen to study its radar cross section characteristics。 At the same time, the influence of the incident wave direction, the substrate dielectric constant, and the size of the surface of the checkerboard on the radar cross section is investigated。
3。 An electromagnetic band gap structure of a regular hexagon checkerboard and an electromagnetic band gap structure of a regular octagon checkerboard are designed, and the radar cross section characteristics are studied in the case of normal incidence and oblique incidence。
Keywords Radar cross section Reduction Electromagnetic band gap
目 次
1 绪论 1
1。1 研究背景及意义 1
1。2 雷达截面减缩的研究现状 2
1。3 EBG结构减小雷达截面研究近况 3
1。4 本文研究内容及安排 7
2 理论分析 8
2。1 雷达散射截面理论分析 8
2。2 电磁带隙结构基本理论 10
2。3 应用EBG结构减小雷达截面 11
3 电磁带隙结构设计 15
3。1 方形棋盘面设计 15
3。2 四元素棋盘面的分析 20
4 不同棋盘面形状的电磁带隙结构 26
4。1 正六边形棋盘面 26
4。2 正八边形棋盘面 29
4。3 小结 32
结 论 33
致 谢