A novel four-legged loaded element thick-screen frequency selective surface with a stable performance

Because thick-screen frequency selective surface (FSS) has not only a broad bandwidth but also an advantage of overcoming multilayer FSS shortcoming of complex structure and low transmittance of centre frequency due to the cascade of FSSs, it has a potential application to the stealth curved streamlined radome. However, there are an unsteadiness of centre frequency in a wide range of incident angle and another unsteadiness of polarization in a big incident angle. In order to solve the problems, in this paper we provide a novel four-legged loaded element thick-screen FSS. The structure is analysed and simulated using mode matching method and moment method. The centre frequency, the transmittance of centre frequency, and bandwidth of the structure are investigated when some parameters including the polarization at a big incident angle and the incident angles of TE & TM waves are changed. The novel four-legged loaded element thick-screen FSS has better transmission properties with a better steadiness of polarization and incident angle independence. The novel structure of four-legged loaded element thick-screen FSS provides a valuable reference for the application in stealth curved streamlined radome.