Isolation enhancement of a wideband MIMO antenna using floating parasitic elements

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Abstract
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 elements on the bottom of the substrate; each having a length equal to λ/2 at a specific frequency. Each resonant element offers a resonant bandwidth of 1 GHz starting from 3 GHz to 8.5 GHz. Good agreement between the measured and simulated results shows that the antenna system 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 × 40.5 mm2, and it is suitable for handheld devices, personal digital assistants, next generation home entertainment systems, and robots. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1677–1682, 2015

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