一种介质-金属加载圆孔单元厚屏频率选择表面

厚屏频率选择表面能较好地改善FSS带宽性能,是实现隐身雷达天线罩的有效手段.为了全面掌握厚屏FSS的传输特性,给FSS的工程应用提供可靠依据,本文设计了一种介质-金属加载圆孔单元的厚屏频率选择表面.采用矩量法对此结构进行分析计算,主要研究了加载金属直径、加载介质厚度、电磁波入射角等几个参数对厚屏FSS传输特性的影响规律.仿真实验结果表明:带宽、中心频率及其透过率都对填充介质直径、加载金属直径、加载介质厚度、电磁波入射角和不同排列方式有不同程度的敏感性,可以通过合理调整加载金属直径及加载介质厚度来获得较宽的通带和较高的透过率.这为实现厚屏FSS在曲面隐身雷达天线罩上的应用提供了一种有价值的借鉴.

A dielectric-metal-loaded thick-screen frequency selective surface having circle aperture elements

Thick screen frequency selective surface (FSS) is a very effective means of realizing the stealth radome, since it can better improve the bandwidth performance of FSS. In order to fully grasp the transmission characteristics of thick screen FSS and to provide a sound foundation of realizing their applications for bandpass radomes, a dielectric-metal-loaded thick-screen FSS is designed in this paper. The transmission properties of this structure are analyzed by using the moment method. The transmission characteristics of this structure are investigated when some parameters including the diameter of filling dielectric, the diameter of filling metal, the thickness of filling dielectric, incidence angle of electromagnetic wave, and unit spacing are changed. Simulation results show that the diameter of filling dielectric, the diameter of filling metal, the thickness of loading dielectric, thickness of filling metal, incidence angle of electromagnetic wave, and unit spacing can influence the transmission properties of the dielectric-metal-loaded thick-screen FSS. The diameter of filling metal and the thickness of loading dielectric can be adjusted appropriately in order to obtain a wide passband width and a better penetrating percentage of the central frequency. The novel structure provides a valuable reference for the application in stealth curved streamlined radomes.