International Journal of Engineering, Management & Sciences (IJEMS) ISSN-2348 –3733, Volume-1, Issue-6, June 2014 24 www.alliedjournals.com Abstract— The work represented in paper aims to provide UWB communication without interferences with existing narrowband applications. In this paper a compact ultra-wideband (UWB) printed microstrip antenna with dual band-notched characteristics is presented. The antenna is constructed on an FR-4 epoxy substrate with thickness of 1.6 mm and r =4.4. The antenna uses CSRR and miniaturization in feed line to create dual band-notched characteristics in, 3.3 - 3.6 GHz for WiMAX and 5.1-5.8 GHz for WLAN, respectively. Surface current distributions are used to show the effect of these slots. The proposed antenna shows broad bandwidth and good omnidirectional radiation patterns in the pass band, with a compact size of 26x30 mm2. The proposed antenna operates over 3 to 11GHz for VSWR < 2. All simulations in this work were carried out by using the electromagnetic software Ansoft HFSS 13. This antenna has advantages in simple design, wide bandwidth, and good band-notch characteristic, compact in size and easy in fabrication. Simulated and measured results of the proposed antenna have been presented. Index Terms— Microstrip patch antenna, UWB antenna, feed lines, HFSS. INTRODUCTION An antenna is a specialized transducer that converts radio frequency (RF) field into alternating currents (AC) or vice versa. Ultra wide Band (UWB) communications systems have drawn increasing attention in the past decade. It has now become a promising technology offering high performance for both the indoor and outdoor wireless communication systems, which allow low cost, easy of fabrication, low power consumption and high data rate .Ultra wide band (UWB) technology was a widely applied technology for radar and remote sensing applications [1], [2]. In 2002, the Federal Communication Commission (FCC) has allocated unlicensed radio frequency band from 3.1 to 10.6 GHz for commercial UWB communication systems [3]. After declaration by Federal communication commission (FCC) of unlicensed radio frequency band 3.1-10.6 GHz for commercial use, ultra wideband (UWB) has received great attention from academics and industries. For short distance wireless communication applications, the Ultra Wide Band (UWB) is mainly employed. UWB antennas are used because it has attractive features such as small size, low profile, low cost, ease of fabrication, high data rate, wide impedance bandwidth and good omnidirectional radiation properties [4], [5]. However, the Manuscript received June 19, 2014 Rakesh Kumar Bazad, M.Tech Scholar Department of Electronics Communication, Rajasthan Institute of Engineering and Technology, Jaipur, Rajasthan ultra-wideband systems are very sensitive to electromagnetic interferences with exciting narrowband wireless communication systems. It is necessary to design antenna with multiband filtering characteristics to avoid interferences with applications working in this band. HFSS is used for the simulation and design calculations. The Return loss, VSWR, Impedance characteristics, Notch formation by CSRR and Feed line miniaturization, radiation pattern analysis (E-filed and H-field), Gain of the antenna throughout the band, radiation efficiency of the antenna throughout the band is evaluated. Using HFSS simulation software proposed antenna is designed/simulated and optimized. Further, after designing and optimization in simulation software, the proposed antenna is analyzed for performance. I. ANTENNA DESIGN Figure.1 shows the front view of proposed ultra-wideband (UWB) printed microstrip antenna with dual band-notched characteristics. This antenna is printed on a epoxy FR-4 substrate with thickness of 1.6 mm, dielectric constant of 4.4.The compact size of antenna is 26x30 mm 2 .The antenna uses CSRR and miniaturization in feed line to create dual band-notched characteristics, which is used to avoiding electromagnetic interference. The back view of proposed antenna is showing in Figure. 2. The simulation analysis of this antenna is carried out by applying electromagnetic software Ansoft HFSS 13 simulation software. Fig. 1. Front view of proposed antenna A Design and Implementation of UWB Antenna with band notched characteristics Rakesh Kumar Bazad