Abstract: Abstract: Objective A compact four-trap UWB-MIMO antenna is proposed to solve the problems of limited installation space of ship communication devices and low communication efficiency due to the interference of signals from other equipment. Methods The trapezoidal antenna is constructed by cutting off a part of one side of the trapezoidal shape, adding a part of the other side as a radiating patch, and introducing an improved corrugated I decoupling structure on the ground plate, with the overall dimensions of 36mm×22mm×1.6mm. By etching inverted "U" slits and "L-n" slits on the radiating patch, introducing "C" parasitic branches on the left side and "U" parasitic branches on the right side next to the feeder, the structure is able to realize WLAN (5.15-5.85 GHz), IEEE INSAT/ Super-Extended c-band (5.15-5.85 GHz) and IEEE INSAT/ Super-Extended c-band (5.15-5.85 GHz) applications. Super-Extended c-band (6.1-6.53 GHz), x-band (7.37-7.8 GHz), and radio navigation (RN) band (9.15-9.7 GHz). Results The simulation and test results show that the antenna operates in the frequency band from 2.9 to 10.7 GHz, with isolation greater than 20 dB, and envelope correlation coefficient ECC < 0.02. Conclusions The data indicate that the antenna is well characterized in all aspects and can be widely used in shipboard wireless communication equipment.