## 3 Measurement and Result Analysis
### Bending Analysis for the Proposed Design  
Bending analysis is required to justify the structure performance with bending angles [24; 25] and to talk about the flexibility of the dielectric material. Due to the small unit cell size and similar responses between the unit cell and 2 \(\times\) 2 array-sized FSS, we have considered a 2 \(\times\) 2 fabricated model for the bending analysis of the structure. As shown in Figure 13, the proposed unit cell is bent with three different bending angles 15, 30 and 45 degrees, using the simulation tool, and Figure 14 explains the fabricated 2 \(\times\) 2 array-sized model with three different bending angles like 15, 30 and 45 degrees. The corresponding S-parameters were calculated for both simulation and measurement, and are clearly shown in Figure 15. From Figure 15, we can observe that with the simulation of a 15-degree bent unit cell, the frequencies obtained for S\({}_{11}\) are 9.84 GHz and 11.50 GHz, with S\({}_{11}\) amplitudes of \(-\)32.69 dB and \(-\)23.30 dB, correspondingly, while the obtained frequencies for the S\({}_{12}\) are 8.02 GHz, 8.46 GHz and 11.09 GHz, with S\({}_{12}\) amplitudes of \(-\)34.17 dB, \(-\)37.46 dB and \(-\)26.55 dB, correspondingly. For a 30-degree bent unit cell, the frequencies for S\({}_{11}\) are 9.86 GHz and 11.50 GHz with S\({}_{11}\) amplitudes of \(-\)31.81 dB and \(-\)23.30 dB, correspondingly, while the obtained frequencies for the S\({}_{12}\) are 7.99 GHz, 8.43 GHz and 11.09 GHz, with S\({}_{12}\) amplitudes of \(-\)33.37 dB, \(-\)38.30 dB and \(-\)26.55 dB, correspondingly. For a 45-degree bent unit cell, the obtained frequencies for S\({}_{11}\) are 9.91 GHz and 11.50 GHz with S\({}_{11}\) amplitudes of \(-\)32.05 dB and \(-\)23.30 dB, correspondingly, and the obtained frequencies for the S\({}_{12}\) are 7.99 GHz, 8.43 GHz and 11.09 GHz, with S\({}_{12}\) amplitudes of \(-\)33.37 dB, \(-\)38.30 dB and \(-\)26.55 dB, correspondingly. Whereas for the measurement process for the fabricated prototype, which is shown in Figure 14, the corresponding S\({}_{11}\) obtained frequencies for the 15-degree bent prototype are 9.94 GHz and 11.32 GHz with S\({}_{11}\) amplitudes of \(-\)23.66 dB and \(-\)17.23 dB, correspondingly, while the frequencies obtained for the S\({}_{12}\) are 7.88 GHz, 8.46 GHz and 11.16 GHz, with S\({}_{12}\) amplitudes of \(-\)21.96 dB, \(-\)24.21 dB and \(-\)15.28 dB, correspondingly. For the 30-degree bent for the proposed prototype, the corresponding S\({}_{11}\) frequencies are 9.88 GHz and 11.43 GHz with S\({}_{11}\) amplitudes of \(-\)17.65 dB and \(-\)18.45 dB, correspondingly, and the obtained frequencies for the S\({}_{12}\) are 7.96 GHz, 8.70 GHz and 11.08 GHz, with S\({}_{12}\) amplitudes of \(-\)17.78 dB, \(-\)21.68 dB and \(-\)24.02 dB, correspondingly, and for the 45-degree bend for the proposed prototype, the corresponding S\({}_{11}\) frequencies are 9.74 GHz and 11.65 GHz with S\({}_{11}\) ampli  
Figure 16: (a) E-field distribution, (b) H-field distribution and (c) surface current distributions of proposed structure at 9.84 GHz and 11.50 GHz frequencies with 15\({}^{\circ}\) horizontal bending. Figure 17: (**a**) E-field distribution, (**b**) H-field distribution and (**c**) surface current distributions of proposed structure at 9.86 GHz and 11.50 GHz frequencies with 30\({}^{\circ}\) horizontal bending. Figure 18: (a) E-field distribution, (b) H-field distribution and (c) surface current distributions of proposed structure at 9.91 GHz and 11.50 GHz frequencies, respectively, with 45\({}^{\circ}\) horizontal bending. As shown in Figure 19 explains about the fabricated \(2\times 2\) array-sized model with three different bending angles, 15, 30 and 45 degrees. While Figure 20 shows the proposed unit cell is bent vertically with three different bending angles 15, 30 and 45 degrees using the simulation tool. The corresponding current distribution and S-parameters were calculated for both simulation and measurement, and are clearly shown in Figures 21-24.