Design Optimization of Stacked Patch Antenna for Ultrawideband Application

Ultrawideband (UWB) communication systems have been recently received great attention in the wireless world. It is widely used technology in communications, radar, imaging and remote sensing applications [1]. It will be preferred that an antenna has bandwidth in excess of frequency range from 2.5 GHz to 10.25GHz to include the existing wireless communication systems such as WLAN system operating at 5.15 – 5.825 GHz, IEEE 802.16 WiMAX system operating at 3.3 – 3.6 GHz, C-band (3.7 – 4.2 GHz) satellite communication systems and UWB band (3.1–10.6GHz) [2]. The antenna aspects of UWB systems differ significantly from those narrowband systems. The design of practical antennas that radiate efficiently over an ultrawide bandwidth continues to be a challenging problem [3]. Due to the attractive merits of low profile, lightweight, ease of fabrication and wide frequency bandwidth, patch antennas are currently under consideration for use in ultrawideband (UWB) systems. However, conventional patch antenna suffers typically from a few percent of bandwidth. For this reason much effort is made to develop techniques and find configurations to broaden its impedance bandwidth.