RAM技术在隐身飞行器薄型翼设计中的应用

雷达吸波材料 ( RAM)技术是隐身技术中的重要技术之一 ,并且在隐身武器 ,尤其是隐身飞行器系统设计中得到广泛应用。本文首先简要阐述了雷达吸波材料吸波的基本原理 ,然后以隐身导弹薄型弹翼的低雷达散射截面 ( RCS)设计为例 ,探讨了涂覆型雷达吸波材料涂覆方案的设计思想和方法 ,最后给出一部分隐身飞行器薄型翼面低 RCS设计的样例。     

基于矢量网络分析仪的RCS测量系统及应用

目标散射截面(RCS)的测量是雷达目标识别、成像等研究领域的一个关键环节.环节.在对目标RCS测量原理分析的基础上,提出了一个基于矢量网络分析仪测量目标RCS的测量系统.通过对几个实际目标RCS的测量,说明了该系统不仅结构简单,测量方便,而且功能强大,测量精度高.     

一种高性能单反射面柱形紧缩场微波暗室

介绍了一个单反射面柱形紧缩场暗室,分析了柱面紧缩场的工作原理,其原理是采用一维算法将柱面波转换为平面波.整体暗室以紧缩场为基础,通过综合和优化选型,从暗室、吸波材料、紧缩场设备等多个方面配合设计,达到了较好的综合效果,具有很高的测试性能,可用于高精度的天线测量和雷达散射截面测量.     

High temperature insensitive ultra-thin electromagnetic metasurface based on ytterbium monosilicate ceramic coating

In this article, homogeneous multi-functional materials and artificially design method are proposed to design ultra-thin metasurfaces, which broaden the application over a wide range of temperatures due to their excellent mechanically-thermally stable structure and electromagnetic functional performance. Ideal environmental barrier coating material of ytterbium monosilicate (Yb₂SiO₅) possesses stable dielectric property over a wide temperature and frequency range. As a thermal corrosion resistant coating, NiCrAlY possesses excellent conductivity at high temperatures. These two materials are selected as substrate and conductive units to composite temperature insensitive ultra-thin refractory metasurface coating (RMC) for wideband radar cross section (RCS) reduction. Three types of RMC patterns are discussed, namely chessboard, staggered, and random. The prototype of staggered pattern was prepared using atmospheric plasma spraying (APS) technique. Both the simulated and experimental results indicated that RCS is reduced remarkably in a wideband frequency, as well as demonstrated stable reduction performance over a broad range of temperatures. Along with a protective layer of Yb₂SiO₅, only a thickness of 1.4 mm is required. The protective layer is employed to isolate the contact between the structural layer and the outside environment, which can significantly increase the service life of the metasurface. This work brings bright prospects for various kind of metasurfaces in practical high temperature applications and significantly enriches the research of metasurfaces.     

Ultra‐wideband radar cross‐section reduction using polarization conversion metasurface

In this paper, a novel ultra‐wideband (UWB) chessboard structured metasurface has been designed to realize the monostatic radar cross‐section (RCS) reduction. The unit has a periodic simple multi‐V‐shaped structure can convert linear polarized waves into their orthogonal polarized ones in an UWB ranging from 14.5 to 41 GHz. In addition, the RCS reduction of two kinds of chessboard structures which composed of the proposed unit are compared in this paper, and one of them has been fabricated and tested. Experiments and simulation results show that, under normal incidence of electromagnetic wave, it can achieve RCS reduction over 10 dB within an UWB of 20.5 GHz.     

AC—600反应堆冷却剂系统及其主要辅助系统的设计特点

该文介绍了 AC-600反应堆的冷却剂系统、主设备及其主要辅助系统的设计方案与特点,并与现有600MW 压水堆在经济性、安全性、可靠性等方面进行了比较.     

修正劈表示的边缘等效电磁流的改进及在电磁散射中的应用

本文介绍了修正劈的概念和用其表示的等效边缘电磁流（ＥＥＣ）公式，并应用它们计算了圆盘双站雷达散射截面（ＲＣＳ）；提出一种确定修正劈方向的法则，这种法则是根据几何绕射理论（ＧＴＤ）中有关参数的定义确定的，因而它不是经验的法则。修正劈表示的ＥＥＣ仅利用了经典的Ｋｅｌｌｅｒ锥上的绕射系数公式和修正劈的概念就可得到任意入射和观察方向的ＥＥＣ，它克服一般ＥＥＣ在Ｋｅｌｌｅｒ锥外的方向上定义模糊的缺点。数值结     

底部刻槽旋转弹丸的RCS特性的分析与仿真

通过理论分析和仿真计算,研究底部刻槽弹丸雷达散射截面的变化与电磁波的极化方向以及电磁波的入射方向之间的变化规律,为利用常规测速雷达测量弹丸的转速和姿态的信号处理方法提供理论依据。     

阻抗加载对微带天线辐射和散射的影响

计算了阻抗加载对微带天线RCS的影响，以及加载不同阻抗时天线的辐射性能。结果表明，阻抗加载主要降低天线带内RCS。适当的阻抗加载能有效降低天线RCS，同时还能保证天线的辐射性能。     

在FDTD计算中对连接边界条件及其编程思想的改进

随着军用战斗机隐身反隐身技术的发展,对目标散射特性研究的要求越来越高,雷达技术正是利用目标散射特性,因而RCS的计算研究一直是散射问题研究的一个重要方面.自从K.S.Yee首次提出FDTD电磁散射计算方法以来,由于该方法的诸多优点,已使其成为这一研究领域的重要方法,并逐渐发展成为一种成熟的数值方法,应用范围越来越广.