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International Journal of Antennas and Propagation
Volume 2014, Article ID 897328, 9 pages
http://dx.doi.org/10.1155/2014/897328
Research Article

A Compact Dual-Band Printed Antenna Design for LTE Operation in Handheld Device Applications

1Department of Electronic Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
2Graduate Institute of Communication Engineering, National Taiwan University, Taipei 10617, Taiwan
3Graduate Institute of Computer and Communication Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
4Department of Electrical Engineering and the Graduate Institute of Communication Engineering, National Taiwan University, Taipei 10617, Taiwan

Received 7 March 2014; Revised 23 May 2014; Accepted 24 May 2014; Published 18 June 2014

Academic Editor: Yingsong Li

Copyright © 2014 Ding-Bing Lin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A novel internal printed antenna suitable for triple long-term evolution (LTE) bands for handheld devices is presented. The operating bandwidths of the design are LTE700 (698~800 MHz), LTE2300 (2300~2400 MHz), and LTE2500 (2500~2690 MHz). Through the use of a C-shape broadside coupled feed structure, full operation in the lower band is achieved. The antenna itself uses two unequal path lengths to produce a low frequency band with two resonant modes. The required bandwidth is then adjusted using a couple feed, and finally placed over a ground plane via another C-type coupling element in order to enhance the two low-frequency matches. In the definition of the −6 dB reflection coefficient, the bandwidth of two basic modes in the low frequency band is 0.689~0.8 GHz. We adopt the definition of the −10 dB reflection coefficient for the high frequency mode, and its working frequency bands are shown to be 2.3~2.72 GHz. The antenna size is only 40 × 12 × 0.8 mm3 with a ground plane of 98 × 40 mm2.