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International Journal of Antennas and Propagation
Volume 2014, Article ID 158028, 6 pages
http://dx.doi.org/10.1155/2014/158028
Research Article

Low-Profile Dual-Wideband MIMO Antenna with Low ECC for LTE and Wi-Fi Applications

1R&D Center, WAVE TECH B/D, 15 iljik-ro 94-gil, Seoksu-dong, Anyang, Gyeonggi-do 430-040, Republic of Korea
2R&D Center, GoerTek Korea Co. Ltd., 607 A-dong Digital Empire B/D, 1556 Deogyeong-daero, Yeongtong-gu, Suwon, Gyeonggi-do 443-812, Republic of Korea
3Industry-Academic Cooperation Foundation, NamSeoul University, 91 Daehakro Seonghwan-eup, Seobuk-gu, Cheonan 331-707, Republic of Korea
4Planning and Budget Team, KEIT, 10F KOTECH Building, 305 Teheran-Ro, Gangnam-Gu, Seoul 135-080, Republic of Korea

Received 3 March 2014; Revised 5 May 2014; Accepted 6 May 2014; Published 22 May 2014

Academic Editor: Byungje Lee

Copyright © 2014 Gye-Taek Jeong 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

This paper presents a low-profile dual-wideband multiple input multiple output (MIMO) antenna with low envelop correlation coefficient (ECC) for long-term evolution (LTE) and wireless fidelity (Wi-Fi) applications. The antenna covers LTE band 7 and Wi-Fi as well as wireless broadband (Wibro) and Worldwide Interoperability for Microwave Access (WiMax) (except for the 3.5-GHz band). To aid with integration of a practical mobile terminal, the MIMO antenna elements are placed at appropriate locations by analyzing the surface current distribution and without using any additional isolation techniques. The measured bandwidths with reflection coefficients of <−10 dB are 36.8% in the range 2.02–2.93 GHz and 23.4% in the range 5.10–6.45 GHz. Isolation is satisfied to be >20 dB in the operating frequency ranges of both LTE band 7 and Wi-Fi. Additionally, the calculated ECC is in the range , which is considerably lower than the required for MIMO applications. The measured radiation patterns are appropriate for mobile terminals, and omnidirectional radiation patterns are obtained.