Summary
International Symposium on Antennas and Propagation
2010
Session Number:4FB3
Session:
Number:4FB3-1
MIMO Antenna with Dual Polarized Slotted Strip for Next Generation Mobile Handsets
Minseok Han, Jaehoon Choi,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
The demand for high speed and high quality data transmission in wireless mobile communication has been greatly increased, which makes Multiple-Input Multiple-Output (MIMO) technology attractive for its excellent performance in channel capacity without occupying extra spectrum and radiating power [1]. To realize an effective MIMO system, it is necessary to have a sufficient number of uncorrelated antennas at each end of the link. Mutual coupling or isolation between adjacent antennas is a key factor to achieve high antenna performance in the MIMO antenna configuration. For a low mutual coupling, antennas must be separated far enough to minimize the mutual coupling. However, the space for the internal antenna is not enough to obtain low correlation and mutual coupling in the mobile handsets. So far, many investigations on multiantenna systems using various techniques have been conducted with the goal of improving isolation between the antenna elements. Although several techniques have been reported for high isolation characteristics by employing mushroom-like electromagnetic band gap (EBG) structures [2], defected ground structure (DGS) [3], simple ground plane modification [4] and connecting line facing to the feed point [5], it is still quite difficult for antennas closely located within the limited space in a mobile handset to have good isolation at long term evolution (LTE) band. In MIMO system, the polarization diversity is one of the usually-adopted technologies due to the compactness and low correlation of its radiation system. In this paper, we propose a MIMO antenna with dual polarized slotted strip for next generation mobile handsets. The proposed MIMO antenna consists of two printed dual-band PIFAs which have dual polarized slotted strip. The input port #1 of the first PIFA is orthogonally disposed with respect to the input port #2 of the second PIFA. The orthogonal placement of the two feed points ensures that the dominant polarization of each of the PIFAs is opposite to each other resulting in good isolation performance. The proposed MIMO antenna can cover LTE band 13 (0.746-0.787 GHz) and mobile worldwide interoperability for microwave access band (M-WiMAX band; 2.5-2.69 GHz) services, simultaneously. Details of the design considerations and experimental results of the dual polarized slot strip dual-band MIMO antenna are presented and discussed.