both the individual scatterer and the lattice. Band-stop or band-reject Bandpass Angular filters AFA stacks Fabrication Typically FSSs are fabricated by chemically etching a copper-clad dielectric sheet, which may consist of Teflon (ε=2.1), Kapton, (ε=3.1), fiberglass (ε-4.5) or various forms of duroid (ε=6.0, 10.2). The sheet may range in thickness from a few thousandths of an inch to as much as 20–40 thousand. Applications Applications of FSS range from the mundane (microwave ovens) to the forefront of contemporary technology involving active and reconfigurable structures such as smart skins. Microwave ovens Antennas Radomes EM absorbers See also Fourier optics Photonic crystal Metamaterial Bragg diffraction Diffraction grating Bloch wave Notes References Hunter, Ian, Theory and Design of Microwave Filters (IEE: 2001). Matthaei, George L.; Young, Leo and Jones, E. M. T., Microwave Filters, Impedance-Matching Networks, and Coupling Structures, McGraw-Hill, 1964}. Ramo, S.; Whinnery, J. R. and Van Duzer T., Fields and Waves in Communication Electronics, Wiley, 1994 978-0471585510}. W. Mai et al., Prism-Based DGTD With a Simplified Periodic Boundary Condition to Analyze FSS With D2n Symmetry in a Rectangular Array Under Normal Incidence, in IEEE Antennas and Wireless Propagation Letters. doi: 10.1109/LAWP.2019.2902340 Photonics Scattering, absorption and radiative transfer (optics) Metamaterials Physical optics Fourier analysis Computational electromagnetics