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International Journal of Antennas and Propagation
Volume 2015 (2015), Article ID 436259, 7 pages
http://dx.doi.org/10.1155/2015/436259
Research Article

A High Isolation MIMO Antenna without Decoupling Structure for LTE 700 MHz

1Department of Electronics and Communication Engineering, Sun Yat-sen University, No. 132, Waihuan East Road, Guangzhou Higher Education Mega Center, Guangzhou 510006, China
2SYSU-CMU Shunde International Joint Research Institute, Shunde 528300, China

Received 4 July 2015; Revised 28 August 2015; Accepted 8 September 2015

Academic Editor: Maria E. De Cos

Copyright © 2015 Yanjie Wu and Yunliang Long. 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 long-term evolution (LTE) 700 MHz band multiple-input-multiple-output (MIMO) antenna, and high isolation between the two symmetrical antenna elements is obtained without introducing extra decoupling structure. Each antenna element is a combination antenna of PIFA and a meander monopole antenna. The end of the PIFA and the meander monopole antenna are, respectively, overlapped with the 50 Ω microstrip feed line, the two overlapping areas produce additional capacitance which can be considered decoupling structures to enhance the isolation for the MIMO antenna, as well as the impedance matching of the antenna elements. The MIMO antenna is etched on FR4 PCB board with dimensions of 71 × 40 × 1.6 mm3; the edge-to-edge separation of the two antenna elements is only nearly 0.037 λ at 700 MHz. Both simulation and measurement results are used to confirm the MIMO antenna performance; the operating bandwidth is 698–750 MHz with  dB and  dB.