High gain stacked microstrip folded dipole Yagi antenna configuration for WiMAX applications

This paper demonstrates the design and performance analysis of the stacked microstrip folded dipole Yagi antenna. The proposed antenna design employs three substrates of FR4 material, each having thickness and dielectric constant of 1.62 mm and 4.4, respectively. The proposed antenna design, consists of three substrates (named as Substrate 1, Substrate 2, Substrate 3) stacked together to form stacked microstrip folded dipole Yagi antenna configuration. The director elements, folded dipole feed line and reflector elements have been placed on Substrate 1, Substrate 2 and Substrate3 respectively. The proposed antenna has been designed using CST Microwave Studio 2014. The analyzation of proposed folded dipole Yagi antenna design has been taken place in terms of resonant frequency, return loss (S11), gain (dB), directivity (dBi) and percentage bandwidth. The proposed antenna resonates at 5.38 GHz with an impedance bandwidth of 170 MHz and an operating frequency range of 5.31 GHz – 5.48 GHz. The proposed antenna has return loss (S11) of −61dB at resonant frequency of 5.38 GHz. The antenna has gain of 7.4 dB, directivity of 7.37 dBi and percentage bandwidth of 3.1 percent at resonant frequency of 5.38 GHz. T he proposed antenna has been fabricated and successfully tested for return loss (S11) using E5071C network analyzer and anechoic chamber. The simulation and experimental results have been examined and it has been concluded that the practical results closely match with the theoretical results. The proposed antenna can be suitably used for WiMAX applications.