In this paper, a multiband microstrip patch antenna using defected ground structure is presented. The proposed antenna is designed by applying FR-4 epoxy (Fire-Retardant-4)substrate. By inserting Defected ground structure in the proposed antenna the various parameter have been improved such as return loss, bandwidth, and gain.Design and simulation of this proposed antenna has been done by using HFSS (High frequency simulation software) . The application of this antenna is to make it compatible with bluetooth, Wi-max and WLAN etc.The proposed antenna has been fabricated and tested. And it has been found that there is a good agreement between the simulated and measured result..
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