Dual polarized triple band microstrip antenna for GSM/WiMAX/WLAN applications

This paper represents the design of single feed, triple band microstrip antenna showing dual polarized behavior of radiations for the multiband wireless environment. Proposed antenna has been designed for 1 GHz lower edge frequency having dimensions of 55mm × 55mm × 1.6mm, which results triple band operations including GSM/DCS-1800 (1.71GHz- 1.88GHz), WIMAX (3.3GHz-3.7GHz) and WLAN band (5.15GHz-5.35GHz). Slotting the patch geometry along the radiating widths of patch has been carried out to achieve the circular polarizations (CP) with the same geometry. With triangular truncations on top and bottom of resonating patch, circular polarized band operation has been carried out. Within three bands, WiMAX and WLAN band has made to operate in circularly polarized characteristics, with axial ratio (ARBW) bandwidth of 59 MHz and 101MHz respectively, giving orthogonal E-field distributions for both bands. The single feed CP geometry accomplishes the advantages of simplicity and simple structure when it is used for MIMO (Multiple-Input-Multiple-Output) applications.