Objective A compact quad-notch UWB-MIMO antenna is proposed to address the challenges of limited installation space for ship communication devices and low communication efficiency due to the interference from other equipment signals.

Methods  The trapezoidal antenna is constructed by cutting a portion of one side of the trapezoidal shape, adding a section of the other side as a radiating patch, and incorporating an improved corrugated I-type decoupling structure on the ground plate, with overall dimensions of 36 mm×22 mm×1.6 mm. By etching inverted "U" and "L-n" slits on the radiating patch and adding "C" parasitic branches on the left side and "U" parasitic branches on the right side near the feeder, the structure is capable of supporting WLAN (5.15-5.85 GHz), IEEE INSAT/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) applications.

Results  The simulation and test results show that the antenna operates in the frequency band from 2.9 to 10.7 GHz, with an isolation greater than 20 dB, and envelope correlation coefficient (ECC) of less than 0.02.

Conclusions  The data indicate that the antenna is well-suited for all aspects and can be widely applicable to shipboard wireless communication equipment.