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International Journal of Antennas and Propagation
Volume 2015 (2015), Article ID 851904, 9 pages
Research Article

A Novel Metamaterial MIMO Antenna with High Isolation for WLAN Applications

1Hanoi University of Science and Technology, Hanoi 100000, Vietnam
2Quy Nhon University, Binh Dinh 820000, Vietnam
3Chuo University, Tokyo 1920393, Japan
4Ministry of Science and Technology, Hanoi 100000, Vietnam

Received 11 September 2014; Revised 24 December 2014; Accepted 8 January 2015

Academic Editor: Xinyi Tang

Copyright © 2015 Nguyen Khac Kiem 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.


A compact metamaterial-MIMO antenna for WLAN applications is presented in this paper. The MIMO antenna is designed by placing side by side two single metamaterial antennas which are constructed based on the modified composite right/left-handed (CRLH) model. By adding another left-handed inductor, the total left-handed inductor of the modified CRLH model is increased remarkably in comparison with that of conventional CRLH model. As a result, the proposed metamaterial antenna achieves 60% size reduction in comparison with the unloaded antenna. The MIMO antenna is electrically small (30 mm × 44 mm) with an edge-to-edge separation between two antennas of at 2.4 GHz. In order to reduce the mutual coupling of the antenna, a defected ground structure (DGS) is inserted to suppress the effect of surface current between elements of the proposed antenna. The final design of the MIMO antenna satisfies the return loss requirement of less than −10 dB in a bandwidth ranging from 2.38 GHz to 2.5 GHz, which entirely covers WLAN frequency band allocated from 2.4 GHz to 2.48 GHz. The antenna also shows a high isolation coefficient which is less than −35 dB over the operating frequency band. A good agreement between simulation and measurement is shown in this context.