Compact Quad-band Antenna for WiMax Application

A single feed quad band compact rectangular microstrip antenna for Wi-max applications has been designed and developed. This antenna is incorporated by one c-shaped slot, one L-shaped slot & two I-shaped slot structure along the length on the patch. Four resonating frequencies are obtained at 2.5 GHz with return loss -25.01 dB, 3.5 GHz with return loss -17.9 dB, 4.9 GHz with return loss -25.74 dB and 5.8 GHz with return loss -28.32 dB. The size of the antenna has been reduced by 77.3% when compared to a conventional microstrip patch without slot. An extensive analysis of the return loss, radiation pattern and efficiency of the proposed antenna has been given in this paper. The characteristics of the designed structure is simulated by High frequency structure simulator (HFSS) software and implemented using RT DUROID dielectric substrate which has ϵr = 2.2 and h = 1.575mm. The proposed antenna leads to multi frequency operation makes it suitable for Wireless Communication applications.