Inf. Sci. Lett. 1, No. 2, 85-89 (2012) 85 Analytical Evaluation of Tri-band Printed Antenna Ilyas Saleem, Hamza Nawaz, Istaqlal Ahmed, S. Muzahir Abbas Department of Electrical Engineering, COMSATS Institute of Information Technology, Islamabad, Pakistan Email: ilyas-saleem@hotmail.comReceived: Revised: Accepted: blished online: Abstract: Simulated design and analysis of a simple tri-band microstrip antenna is presented in this paper. A thin transmission line is used to excite the rectangular patch and FR4 epoxy with relative permittivity of 4.4 is used as substrate. To confirm the proficiency of proposed antenna, simulations have been performed in Ansoft HFSS (High Frequency Structure Simulator) a 3D electromagnetic field simulator, based on finite element method. Impedance bandwidths are determined on -10 dB at resonating frequencies of 2.4, 3.3 and 5.3 GHz. An introduced design covers the requisite bandwidth for IEEE Wireless Local Area Network (WLAN) standards: 802.11 a/n, b/g (Wi-Fi), Bluetooth, ZigBee, and 802.16e (WiMAX). Multiband functionality, small size, light weightiness, plain configuration and conformability are the advantages; making the proposed design a good contender for integration in handheld wireless devices. Keywords: Microstrip Patch, Transmission line, Tri-band, Relative Permittivity, Relative Permeability, Dielectric Loss Tangent. 1 Introduction A rapid growth of wireless communications has been observed in recent years. IEEE launched several standards to satisfy the requirements of high data rate. IEEE 802.11a has higher data rate but with low range and IEEE 802.11b/g experiences interference from the other standards using the same frequency band. IEEE 802.11n and IEEE 802.16e support MIMO and WiMAX correspondingly. Now-a-days these technologies are functional with microstrip patch antennas [1, 2]. A compact and economical antenna which is integrate-able with RF and with Monolithic Microwave Integrated Circuits (MMICs) is preferred in mobile terminals [3]. Thus characteristics like flexibility, efficiency and simple fabrication made the patch antennas very attractive for wireless communications [4]. WLAN’s are replacing short distance wired communication links [5, 6] although at designing stage compatibility is the main issue among various access points. Because of a user demands single portable device capable of working at different technologies for applications [7], which eventually becomes a reason to develop multi-standard end-user devices [8-10]. In this work, a tri band patch antenna operating at 2.4, 3.3, and 5.3 GHz is presented. This paper is written in sections. Section II gives details about design; where comprehensive analysis and results are discussed in Section III, while Section IV concludes the paper. 2 Antenna Design The geometry and dimensions of the simulated antenna are given in Fig. 1 and Table 1 respectively. Information Sciences Letters An International Journal @ 2012 NSP Natural Sciences Publishing Cor.