PERFORMANCE OPTIMIZATION OF YAGI-UDA ANTENNA IN WIRELESS COMMUNICATION WITH ADDITIONAL DRIVEN ELEMENTS USING GENETIC ALGORITHMS

摘要

A new structure of Yagi-Uda antenna is proposed that can improve the forward/backward ratio (f/b) significantly while maintaining a high gain. This structure involves the addition of two driven dipole elements to the main Yagi-Uda array, the resulting antenna is denoted by augmented Yagi-Uda. The design of such antenna is performed using GA in conjunction with the SNEC software. Comparisons are made among the augmented and conventional Yagi-Uda configurations for different design parameters. It is observed that an improvement of at least 66dB in the f/b ratio is obtained. Moreover, the augmented antenna outperforms the conventional Yagi-Uda antenna, because it achieves higher performance standards over an extended bandwidth around 2.4GHz.