The future development of personal communication devices will aim to provide image, speech and data anywhere around the world at any time. This indicates that the future communication terminal antennas must meet the requirements of wideband to sufficiently cover the possible operating bands. The aim of this paper is to improve the bandwidth and return loss of H-shaped patch microstrip antenna using EBG structure on ground plane. EBG structure is a periodic arrangement of dielectric materials and metallic conductors on ground plane of antennas. Microstrip antennas mounted can radiate only a small amount of its power into free space as more power leakage through the dielectric substrate. To improve the efficiency of the antenna, the propagation through the substrate must be prohibited so the antenna can radiate more power towards the main beam direction and hence improve its efficiency. As the proposed antenna has resonant frequency at 2.496 GHz so suitable for ISMband applications. For designing this, we uses CST software tool. The designed antenna offers much improved bandwidth of 59.9 MHz and return loss is -30.02 dB as compared to conventional H-shaped patch microstrip antenna which having bandwidth of 33 MHz and return loss is -12.43 dB.
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