The paper presents a compact tri band U slot microstrip patch antenna. The proposed antenna resonates at triband of 3.7GHz,5.8GHz and 7.1GHz frequencies for VSWR ≤ 2.5with an improved impedance bandwidth of 42% and a reduced mutual coupling of-23dB and the antenna is modified by using a shorting pin giving an improved bandwidth of 54% and isolation of-28dB which antenna resonates at tri band of 3.2GHz, 3.7GHz and 6.4 GHz frequencies for VSWR ≤ 1.6.The proposed antenna is a better choice for 4G, WLAN,Wi-MAX and Ultra Wide Band applications involving MIMO technique.
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