Isolation enhancement of a wideband MIMO antenna using floating parasitic elements

A Multiple-input multiple-output antenna array with two radiating elements having a wide bandwidth is reported in this work. Spatial diversity has been introduced to achieve the diversity gain and the array was kept compact by introducing five parasitic decoupling ele- ments on the bottom of the substrate; each having a length equal to k/2 at a specific frequency. Each resonant element offers a resonant band- width of 1 GHz starting from 3 GHz to 8.5 GHz. Good agreement between the measured and simulated results shows that the antenna sys- tem performs very well over the frequency range 3 GHz to 8.5 GHz. In addition, an isolation of more than 15 dB is achieved with the help of the parasitic elements, while keeping an edge-to-edge and center-to- center separation of 4 mm and 19 mm, respectively. The proposed antenna measures 26 3 40.5 mm 2 , and it is suitable for handheld devi- ces, personal digital assistants, next generation home entertainment sys- tems, and robots. V C 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1677-1682, 2015; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.29162