size. To investigate whether the 3D surfaces have lower resonant frequency or not, the transmission responses are simulated. The reflection phase responses of 3D saw-tooth AMCs are presented in the following section. 5.1 Flat square loop FSS geometry One of the most common shapes used in FSS is square loop as in Figure 5.1. The unit cell size is set to 10mm×10mm. The square loop is etched on a substrate with permittivity of one and thickness of 0.5mm. The square loop material is a kind of lossy metal type copper. The length, width and thickness of the square loop are 6mm, 2mm and 0.01mm, respectively. The other parameters are shown in Table 5.1. (a) Geometry of flat Square loop FSS. (b) Unit cell boundary conditions. Figure 5.1 Unit cell of flat square loop FSS Table 5.1 Parameters of flat square loop FSS. Parameter Value(mm) Description m 10 Size of unit cell g 2 Gap between copper and unit cell L 6 Length of copper w 2 Width of copper t 0.01 Thickness of copper n 0.5 Thickness of substrate 5.2 3D square loop FSSs geometries There are four types of three-dimensional square loop FSSs are designed in this section. The type 1 structure is formed by raising the inner side of the flat square loop to an angle which is not vertical. The new structure is shown in Figure 5.2. The second type
size. To investigate whether the 3D surfaces have lower resonant frequency or not, the transmission responses are simulated. The reflection phase responses of 3D saw-tooth AMCs are presented in the following section. 5.1 Flat square loop FSS geometry One of the most common shapes used in FSS is square loop as in Figure 5.1. The unit cell size is set to 10mm×10mm. The square loop is etched on a substrate with permittivity of one and thickness of 0.5mm. The square loop material is a kind of lossy metal type copper. The length, width and thickness of the square loop are 6mm, 2mm and 0.01mm, respectively. The other parameters are shown in Table 5.1. (a) Geometry of flat Square loop FSS. (b) Unit cell boundary conditions. Figure 5.1 Unit cell of flat square loop FSS Table 5.1 Parameters of flat square loop FSS. Parameter Value(mm) Description m 10 Size of unit cell g 2 Gap between copper and unit cell L 6 Length of copper w 2 Width of copper t 0.01 Thickness of copper n 0.5 Thickness of substrate 5.2 3D square loop FSSs geometries There are four types of three-dimensional square loop FSSs are designed in this section. The type 1 structure is formed by raising the inner side of the flat square loop to an angle which is not vertical. The new structure is shown in Figure 5.2. The second type
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