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Abstract
A closely-located MIMO antennas of tri-band with an inter-PIFA (Planner Inverted-F Antenna) spacing of only 20 mm is proposed for WLAN mobile terminal applications. Two L-shaped slots etched on each PIFA are introduced appropriately to achieve high isolation at higher frequencies and tri-band property. The MIMO antenna can operate in the bands of 2.4–2.4812 GHz, 5.07–5.4 GHz and 5.64–6.61 GHz, and the mutual couplings are less than −16.5 dB, −27 dB and −23 dB, respectively. Radiation pattern, gain and efficiency are also measured. Our designed antenna has the advantages of closely-located structure, tri-band, high isolation, small variation of gain and high efficiency.