Bandwidth enhancement of compact UWB microstrip patch antenna using EBG structures

Since the release by the Federal Communications Commission (FCC) for ultra-wideband (UWB) wireless communications (from 3.1GHz to 10.6GHz), UWB is rapidly advancing as a high data rate wireless communication technology. There are more challenges in designing a UWB antenna than a narrow band one. To choose an optimum antenna topology for UWB design, several factors must be taken into account including physical profile, compatibility, impedance bandwidth, radiation efficiency, and radiation pattern. The main challenge in UWB antenna design is achieving the very broad bandwidth with high radiation efficiency and small in size. The proposed compact UWB antenna structure has been fabricated, analyzed using a commercial software and the radiation characteristics, such as, return loss and the surface current densities have been introduced, which offered excellent performance and have measured lower S₁₁ up to -31.4 dB with bandwidth 22.34%.