Table 4: Comparing the optimal result of = 142 and = 6 with [21, 22]. Function model algorithm using MGA (FMAMGA), element number (), ring radii (), and element number in the rings ().

methodPSLL (dB)123456

Opt [21]-27.821420.761.362.092.993.784.70
91725312633

Opt by MGA [22]-28.071420.761.362.092.923.774.70
91626302733

FMAMGA-28.191420.841.372.102.953.784.70
101725292931