Time Domain Behaviors of Artimi's UWB Antenna

Abstract

In this paper, a time domain study of Artimi's UWB antenna is presented. Firstly, the antenna's frequency domain behavior is illustrated. Thereafter, a detailed time domain investigation of the antenna is highlighted. It has been shown that Artimi's UWB antenna generally exhibits a good performance in both frequency and time domain. Wireless communications have been advancing with an astonishing rate during the last decade and wireless devices for future applications are required to offer manifold services like video, speech, data, and so on. This uprising demand accelerates the need for antennas capable of covering multiple bands or an ultra wideband for various systems. Since the Federal Communications Commission (FCC) released a bandwidth of 7.5 GHz for ultra wideband (UWB) applications, UWB has been evolving as a wireless technology of high potential. And UWB antennas have consequently attracted more and more attention from both academia and industries worldwide. However, unlike conventional narrow band antennas, design and analysis of UWB antennas are confronting more challenges. Some elemental antenna parameters need to be re-addressed or re-evaluated within the UWB definition scope. And due to UWB's unique features, there is a necessity to study UWB antennas from both the time and frequency domain perspective (1)-(3). In this paper, a UWB antenna developed by Artimi Ltd is investigated experimentally. Firstly, the frequency domain behavior of the antenna is described. And transient characteristics of the antenna are studied next. To explore more in detail the time domain behavior of the antenna, various measurements for different antenna pair orientations were performed. It has been demonstrated that Artimi's antenna generally exhibits a good performance in both frequency and time domain. II FREQUENCY DOMAIN BEHAVIOR OF ARTIMI'S UWB ANTENNA The antenna investigated in this paper is a printed dipole on both sides of the printed-circuit-board (PCB), as shown in Fig. 1. The antenna design is the intellectual property of Artimi Ltd (www.artimi.com) and is patented and copyrighted. More structural details about this antenna can be found from Artimi Ltd (4). Fig. 2 illustrates the measured return loss curve. As can be seen from the plot, this antenna can provide a satisfactory ultra wide frequency bandwidth.