Abstract|Concentric circular antenna array (CCAA) is synthesized
to generate pencil beam with minimum side lobe level (SLL). The
comprehensive learning particle swarm optimizer (CLPSO) is used for
synthesizing a ten-ring CCAA with central element. This Synthesis
is done by finding the optimum current excitation weights and
interelement spacing of rings. The computational results show that
sidelobe level is reduced to ¡40:5 dB with narrow beamwith about
4:1±.