Table 2: Comparison between the periodic structures derived from the best individuals shown in Figures 5, 6, and 7.

@ 14.2 GHz    −90° : 90°

Yang et al. [3]20.52°13.9 GHz–14.56 GHz
Case A122.2°13.8 GHz–14.52 GHz
Case B110.83°13.6 GHz–14.75 GHz
Case C810.5°13.1 GHz–15.4 GHz

: number of generation required to reach the best individual; : phase of the reflection coefficient; : frequency bandwidth for −90° : 90° .