DESIGN OF WIDEBAND OMNIDIRECTIONAL MICROSTRIP PATCH ANTENNA FOR WIRELESS APPLICATIONS

Abstract

This paper proposes a design of a wideband omnidirectional microstrip patch antenna, which can be used in wireless applications such as WLAN, WiMAX... The antenna is designed on FR4 substrate, rectangular microstrip patch, heterogeneous structured feed line. In addition, the solution of cutting an annular-slot on the microstrip patch can help to extend the bandwidth of antenna more than 4 GHz (from 1.91 GHz to 6.14 GHz). In this paper, the design and investigation of antenna parameters at 2.4 GHz WLAN and 3.5/5.5 GHz WiMAX frequencies are carried out on HFSS software. Accordingly, the proposed antenna has a omnidirectional radiation pattern at each above, the gain is 2.4 dBi (at 2.4 GHz), 3.89 dBi (at 3.5 GHz) and 3.2 dBi (at 5.5 GHz).