VNU Journal of Science: Comp. Science & Com. Eng., Vol. 31, No. 2 (2015) 8-14 A Novel Design of Antenna for the 3G Mobile Devices Ha Quoc Anh * , Nguyen Quoc Dinh Department of Fundamentals of Radio and Electronic Engineering, Le Quy Don Technical University, Hanoi City, Vietnam Abstract This paper proposes a novel structure of the inverted F antenna based on meandering and folding methods for the monopole antenna placed on FR4 dielectric plate. The proposed antenna has compact size (21 mm × 14 mm × 3.2 mm). Moreover, this antenna still offers enough wide bandwidth (VSWR  2), which covers 3G bandwidth. Using the simulation program to optimize antenna structure and calculate the antenna parameters in order to verify its applicability for the 3G mobile devices. © 2015 Published by VNU Journal of Science. Manuscript communication: received 04 May 2014, revised 29 April 2015, accepted 25 June 2015 Corresponding author: Ha Quoc Anh, haquocanh1812@gmail.com Keywords: 3G, Inverted F Antenna, Miniaturization of Antenna. 1. Introduction Nowadays, with the rapid growth of wireless means of communication, there is a growing demand for mobile devices that are small, thin, attractive, lightweight, and curvy. To satisfy the above demand, it is necessary to miniaturize mobile device’s components. Especially, antenna, an essential part, is miniaturized in order to put into the device. Many studies and suggestions about typical antenna structure for portable devices have been published recently. D. Bonefacic [1] proposed a design for a micro-strip antenna that works on central frequency of 2.0 GHz and has very small size (30 mm × 12.9 mm × 5 mm) but the bandwidth of the proposed antenna is too narrow (26 MHz). Y. Kim [2] proposed a folded loop antenna system for new future handsets. M. Karaboikis [3] proposed a dual- printed inverted F antenna structure for terminal devices. K. Sarabandi [4] proposed a method of miniaturized size antenna as small as 0.05 × 0.05. M. Akbari [5] presented an approach to optimize the antenna structure by creating a planar inverted F antenna (PIFA). However, the overall size of the proposed antennas in the references is still quite large; therefore it is difficult for the mobile device to miniaturize its size for applications in MIMO system. In order to overcome the said shortcomings, in the reference document [6], an antenna with smaller size (23 mm × 14 mm × 5 mm) is proposed which can be applied for 3G mobile devices. In this paper, the authors use Ansoft HFSS software to miniaturize antenna structure for the 3G mobile devices based on meandering and folding methods for the monopole antenna, which is developed from the inverted F