A Four-Leaf Clover Shape MIMO Antenna for UWB Applications
Keywords:
High isolation, multiple input multiple output (MIMO) antennas, slot antenna, Ultra-wideband (UWB)Abstract
This paper proposes a quad-element multipleinput multiple-output (MIMO) antenna for handheld wireless Ultra-wideband (UWB) devices, which has pocket dimensions of 40 mm × 40 mm. An elaborate tapered slot antenna fed by a gradient microstrip acts as the single radiation element. The slots evolved from exponential function are to achieve the UWB properties, and the four slots which aim to four directions constitute the four-leaf clover shape. The UWB antenna shows good impedance (S11 < -10 dB) match in a UWB band from 4 GHz to 13 GHz and performs high efficiency (above 80%) and high isolation (S21, S31 < -20 dB). Realized gain is around 3 ~ 5 dB. The envelope correlation coefficient (ECC) is also investigated and it is within acceptance limits.
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References
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