Performance evaluation of two popular antennas designed using a Bacteria Foraging Algorithm

Abstract Two popular antennas such as the Yagi-Uda Array (YUA) and the Log Periodic Dipole Array (LPDA) with the same number of dipole elements are optimally designed using Bacteria Foraging Algorithm (BFA). BFA being one of the successful optimization algorithms, used to optimize many design parameters of these two antennas to get a number of desired performance parameters. A YUA is designed here, mainly to realize high directivity, input-impedance ( Z in ) close to 50 Ω, high Front To Back Ratio ( FTBR ), high Front-to-maximum-Side-Lobe-Level ( FSLL ), low Half Power Beam Width ( HPBW ), and appreciable bandwidth, whereas a LPDA is designed here, mainly to achieve high bandwidth, average Z in close to 50 Ω, high average FTBR , high average FSLL , low average HPBW , and appreciable average directivity. The successful design approaches, application and comparative study of these two antennas presented here can also be extended to other antennas.