Indonesian Journal of Electrical Engineering and Computer Science Vol. 15, No. 1, July 2019, pp. 294~299 ISSN: 2502-4752, DOI: 10.11591/ijeecs.v15.i1.pp294-299  294 Journal homepage: http://iaescore.com/journals/index.php/ijeecs Design and analysis of dual band integrated hexagonal shaped microstrip UWB antenna Alaa Desher Farhood 1 , Maham Kamil Naji 2 , Suhad Hasan Rhaif 3 , Adnan Hussein Ali 4 1,4 Electronic Techniques Department, Technical instructors training institute, Middle Technical University, Iraq 2 Electronic Techniques Department, Institute of Technology, Middle Technical University, Iraq 3 Electrical Techniques Department, Technical instructors training institute, Middle Technical University, Iraq Article Info ABSTRACT Article history: Received Oct 1, 2018 Revised Dec 10, 2018 Accepted Jan 25, 2019 In this paper, we proposed a hexagonal shaped microstrip ultra-wideband (UWB) antenna integrated with dual band applications. The antenna design consists of a hexagonal shape patch with two folded Capacitive Loaded Line Resonators (CLLRs) on the left edge of the patch antenna. This hexagonal structure is used to implement UWB applications (3.1-10.6 GHz). A rectangular ground, and two CLLR are also used on the bottom of antenna to obtain the extra dual resonant frequency at 2.4 GHz and 9.1 GHz for Bluetooth and radar applications respectively. The proposed design is implemented using FR4 epoxy substrate. The relative permittivity of the substrate is 4.4. The overall size of designing antenna is 26 × 30 mm2 with 1.6 mm as thickness and fed by standard feed line of 50 Ω microstrip. The results obtained from the simulation indicate that the designed antenna attains a good bandwidth from 1.1 GHz – 10.69 GHz with VSWR < 2 and return loss < -10 dB. The proposed geometry is simulated by using the Ansoft HFSS simulator working on the principle of FEM and results are also analyzed. Keywords: Bluetooth CLLR Dual band FEM HFSS Microstrip antenna Resonant frequency Return loss VSWR Copyright © 2019 Institute of Advanced Engineering and Science. All rights reserved. Corresponding Author: Alaa Desher Farhood, Technical Instructors Training Institute, Middle Technical University, Baghdad, Iraq. Email: alaa.desher@gmail.com 1. INTRODUCTION In 2002, the Federal Communications Commission (FCC) announces the frequency bandwidth of ultra wideband (UWB) system. The commercial bandwidth of UWB is 3.1 -10.6 GHz. This is the very large frequency bandwidth in the communication system. Due to the very fast development in wireless communication system, a very large number of researchers have given their research interest in designing and implementation of various type of antenna for UWB applications. The UWB antenna has some special features such as low power consumption, high data rate, omni directional with maximum accuracy. The size of the antenna also becomes compact with minimum cost. For communication applications, the FCC provides - 41.3dBm/MHz as an effective isotropic spectral power density of the UWB bandwidth system [1, 2]. In other hand, the designing part of the UWB antenna has some challenges like electromagnetic interference (EMI), compact antenna design with good result of radiation pattern and impedance matching properties over the entire frequency band from 3.1-10.6 GHz [3-4]. Due to wide spectrum bandwidth of UWB system, a lot of researcher puts their interest to enhance the research technology for UWB applications in different communication systems [5-10]. In UWB microstrip patch antenna, it consists of radiating patches on the upper side of antenna called dielectric substrate, whereas ground is designed on the back side of