Transmission/Scattering Characteristics of Curved Frequency Selective Surface with Double-Layer of Ring Slots

Loading with frequency selective surface (FSS) is one of the effective means to improve stealth performance of object. However, most of the available works were conducted based on infinite planar FSS, few studies are focused on FSS with finite size, especially for curved FSS, which are more suitable for practical application. In this paper, FSS models for different finite structures are established based on the double-layer of ring slots unit, which exhibits excellent angular stability. The results show that, for finite curved FSS with plane wave incident from axial direction, the transmission properties is similar to that of infinite planar FSS with plane wave incident from large inclined angle direction. By using the double-layer of ring slot unit, the curved FSS shows a stable passband, and can reduce the out-of-band scattering cross section, while maintaining the antenna radiation performance unchanging.