A compact dual-polarized UWB antenna with high port isolation

As the Federal Communication Commission (FCC) approved the use of 3.1–10.6 GHz frequency band for Ultra-Wideband (UWB) system in 2002, there have been growing interests in designing low profile, cost effective and highly integrated UWB antennas. The widely used single element UWB antenna configurations are of monopole type [1]-[2], aperture type [3]-[4] and tapered slotline type [5]-[6] antennas. All these three types of antennas may achieve good return loss and radiation performances. On the other hand, owing to the demands of high data rate transmission, multiple-input multiple-output system (MIMO) system has gained increasing interests and becomes the standard for many communication systems. UWB MIMO system requires multiple antennas with a wide impedance bandwidth and good isolation performance between antenna ports. Several types of MIMO antennas have been successfully proposed for the application. In [7], spiral and sinuous antennas are used to provide multimode radiation. Spaced wide slot antennas are proposed for MIMO applications in [8]. Two different types of antennas operating with orthogonal modes for good isolation are reported in [9]. In this paper, a compact, high isolation, and dual polarized antenna is presented. The proposed antenna is compact and has good port isolation and radiation performances, making it suitable for UWB MIMO applications.