Based on the concept of periodic structural unit, a chessboard structured composite composed of quartz fiber and carbon fiber is proposed in this study for reducing radar cross section (RCS). An automated manufacture technique – stitching was applied in the unit construction, showing the great potential on mass production and low cost. The design of RCS reduction adopts the cooperative mechanisms of absorption and scattering. The results show that the RCS reduction of chessboard structured composite is below −10dB in the range of 8.9–15.1 GHz, and the peak value of the RCS reduction can reach −23dB. By simulating the different unit parameters of chessboard regions, the optimal parameters are obtained. Region 0 and region 1 present different energy distributions and a phase difference of 180° ± 78°, which is an important reason for the scattering mechanism of chessboard structured composite. To further explore the mechanisms of scattering and absorption, the electric field, magnetic field and power loss of the two regions at the absorption peak are simulated. According to the absorption energy distribution, it can be inferred that impedance matching plays an important role in the absorption mechanism. Moreover, the oblique incidence test and simulation prove the good angular stability of chessboard structured composite. The good mechanical properties of chessboard structured composite demonstrate the great potential of structure-function integration. Furthermore, the mass production capacity of the proposed composite gives the broad prospects in practical engineering application.

中文翻译：

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使用棋盘结构复合材料通过散射和吸收机制实现 RCS 减少

基于周期结构单元的概念，本研究提出了一种由石英纤维和碳纤维组成的棋盘结构复合材料，用于减小雷达散射截面（RCS）。单元结构采用自动化制造技术——缝合，显示出大规模生产和低成本的巨大潜力。RCS降低的设计采用了吸收和散射的协同机制。结果表明，棋盘结构复合材料的RCS降低在8.9~15.1 GHz范围内低于-10dB，RCS降低峰值可达-23dB。通过模拟棋盘区域的不同单元参数，得到最优参数。区域0和区域1呈现不同的能量分布和180°±78°的相位差，这是棋盘结构复合材料散射机制的重要原因。为了进一步探讨散射和吸收的机制，模拟了吸收峰两个区域的电场、磁场和功率损耗。根据吸收能量分布，可以推断阻抗匹配在吸收机制中起着重要作用。此外，斜入射测试和模拟证明了棋盘结构复合材料具有良好的角稳定性。棋盘结构复合材料良好的力学性能展示了结构-功能集成的巨大潜力。此外，所提出的复合材料的大规模生产能力在实际工程应用中具有广阔的前景。