A　high　gain　linear　MIMO　antenna　array　for　5G　mobile　terminal　is　proposed　in　this　article.　Based　on　microstrip　antenna　technology,　the　array　element　is　designed　by　slotting　an　H-shape　groove　on　the　patch　to　expand　the　working　bandwidth　of　the　antenna.　This　element　can　be　employed　to　form　the　linear　MIMO　antenna　array.　In　our　work,　a　2　×　4　antenna　array　is　constructed　and　analyzed　by　HFSS.　Simulation　results　show　that　the　designed　antenna　arrays　exhibit　good　performances.　The　working　frequency　of　the　designed　array　is　from　3.43　to　3.67　GHz.　One　conclusion　can　be　obtained　that　with　the　increase　of　the　number　of　the　elements,　the　gain　become　higher　by　appropriately　settled　the　antenna　elements.　The　measured　results　of　the　array　are　relatively　consistent　and　slightly　better　than　the　simulation　results.　The　designed　antenna　array　is　suitable　for　5G　mobile　terminal.　©　2023　IEEE.