A triple-band notched ultra-wideband(UWB)-multiple-input multiple-output(MIMO)antenna with high isolation is proposed

and the overall size is 23mm×31mm×1.6mm.The UWB is achieved by making inverted "W"-shaped cuts on the bottom sides of the radiating patch and by narrowing the feed line.Grounding plate is improved to a stepped "T"-shaped decoupling structure with semicircular notches to achieve a higher degree of isolation.The concentric squares-shaped slit is etched on the feed line

the "U"-shaped slit is etched on the radiating patch

and by loading the "U"-shaped parasitic branches on the right side to realize the notching of three frequency bands

namely

WLAN (5.15-5.85GHz)

X-band(7.25-7.75GHz)

and International Telecommunication Union(ITU)(8.01-8.5GHz).The simulation and test results show that the antenna operates in the frequency band of 3.09-12GHz(relative bandwidth reaches 118%)

the isolation is less than -21.55dB

the envelope correlation coefficient(ECC)is less than 0.01

the radiation efficiency is high

the radiation characteristics are good

and the designed antenna can be widely used in the field of wireless communication system.