ABSTARCT This paper demonstrates the design and result of a high gain miniaturized slit loaded microstrip patch antenna with Defected Ground Structures (DGS) for wireless applications. The proposed antenna is coaxially probe fed, has an array of rectangular slits etched on the patch and a pair of rectangular shaped DGS loaded into the ground plane of the antenna. The bandwidth of a slit loaded microstrip patch antenna is 12% whereas it increases up to 14% when DGS is loaded into the ground

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... . The proposed compact antenna resonates at multiple frequencies between 1 to 9 GHz frequency range at 3.28 GHz, 3.6 GHz, 5.6 GHz and 6.9 GHz with a bandwidth of 160 MHz, 150 MHz, 70 MHz and 260MHz having return loss of-17 dB,-27 dB,-17 and-23 dB respectively. The antenna has been simulated at 5.5 GHz using an electromagnetic simulation tool named CADFEKO. The proposed multiband antenna finds useful applications with an improved performance in WIMAX (3.2-3.8 GHz, 5.2-5.8 GHz, 6.9-7.8 GHz) applicaton. The plots of various antenna parameters like Return loss, Voltage Standing Wave Ratio (VSWR), Gain, Bandwidth etc. of the proposed antenna has been observed with and without DGS and the analysis of the simulated results shows that the proposed slit loaded antenna with DGS is more efficient than Conventional Rectangular Microstrip Patch Antennas (CRMPA) in terms of bandwidth of operation and miniaturization.