This paper presents an ultra-wideband microstrip antenna that can be used in the 5G millimeter wave band. Compared with similar literature, by rational use of the meandering technique, can effectively guarantee bandwidth. The size of the antenna is 18 mm × 28 mm × 0.514 mm. The return loss of the antenna reached 16.84% (26.93-31.89 GHz), which is higher than 15.7% of the similar literature and has a wider bandwidth. And the gain of the antenna is 9.21dBi, which is higher than 8.38dBi of the similar literature. Meet the efficiency requirements of 5G millimeter wave mobile communication systems.