Optimal design of special corner reflector antennas by the real-coded genetic algorithm

This paper presents an optimal design approach based on the popular realistic field simulator Numerical Electromagnetic Code (NEC) and the effective real coded Emperor-Selective genetic algorithm (EMS-GA) for automatic antenna design optimisation. In this approach, the chromosomes used in EMS-GA are directly coded with real number geometrical dimensions. The geometrical input data for NEC is automatically generated and the electromagnetic response is also automatically simulated. The results are linked with the EMS-GA optimiser for optimisation of the desired parameters. As an example and a real engineering application, a special corner reflector antenna driven by a Yagi-Uda array is designed by the NEC/EMS-GA approach. Compared to the traditional Yagi-Uda, the designed antenna has much lower side lobe level (SLL) with better immunity to interference and may find applications in wireless communication and TV reception