Double U slotted microstrip rectangular patch antenna for GPS applications

A double U slot microstrip rectangular patch antenna with truncated corners is demonstrated in this paper. The antenna has been designed with FR4 substrate material whose dielectric constant is 4.4 with defected ground plane using coaxial probe feed. Two U slots are cut from the patch and third U slot is cut from the ground plane to make it defective. Performance parameters like return loss (dB), VSWR, gain (dB), bandwidth (GHz) and radiation pattern of proposed antenna are improved than conventional antenna. The return loss of proposed antenna is -22.9dB at resonant frequency 1.1 GHz where as the return losses of conventional antenna -12.39dB at 1.9 GHz frequency. It is observed that resonant frequency of proposed antenna is shifted towards the lower side. By introducing two U slots in the rectangular patch, truncating the corners of patch and one U slot in the ground plane the size of proposed antenna has been reduced near about 60% as compared to conventional antenna. HFSS (high frequency structural simulator) software is used to investigate the characteristics of this antenna.