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.