Abstract: Abstract：[Objectives] In order to solve the limitation of the installation space of shipboard communication devices and the low communication efficiency of shipborne antennas due to interference of signals by other equipment, a miniaturized and high-isolation compact MIMO antenna that can cover a wide frequency band is proposed. [Methods] The antenna unit is based on an elliptical patch that expands into the final octagonal structure by rotational translation; The four units are placed orthogonally on the dielectric substrate, which improves the data transmission rate and channel capacity of the antenna; By adding a square metal patch on the back of the antenna to improve the isolation between the antenna units, the overall size of the antenna is only 32*32mm2. [Results] The measured results show that The impedance bandwidth of S11≤-10dB is measured to be 3.4-10GHz, the S31 of the antenna drops from about -15dB to less than -22dB, the lowest is as low as -46dB, and the isolation is improved by 31dB; the antenna envelope correlation coefficient is less than 0.05, the diversity gain is greater than 9.7dB; the highest gain of the antenna can reach 4.5dBi. [Conclusions] On the basis of miniaturization, the MIMO antenna can cover a wide frequency band and has a high degree of isolation, and has the characteristics of anti-interference and high channel capacity, which can be widely used in shipborne wireless communication equipment.