Dual-element folded dipole design for broadband multilayered Yagi antenna for 2G/3G/LTE applications

A vertically multilayered Yagi antenna is presented. The antenna consists of a novel dual-element folded dipole, three latticed director arrays and a ground plane. The dual-element folded dipole is composed of a pair of folded dipoles which are fed by an internal feedline. It mainly makes the proposed Yagi have a bandwidth of 70.8% (1.34-2.83 GHz) for a return loss (RL) > 10 dB. The latticed director arrays and the ground plane are utilised to enhance the gain performance of the multilayered Yagi antenna. The measured and the simulated results indicate that a gain better than 10.8 dB and a front-to-back ratio (FBR) higher than 20 dB can be obtained in the frequency range 1.7-2.83 GHz which covers the second generation 2G/3G/long-term evaluation (LTE) application.