Broadband multi-frequency omni-directional array antenna

The invention discloses a broadband multi-frequency omni-directional array antenna which is mainly used for solving the problem that the existing omni-directional array antenna has narrow frequency band and is easy to be affected by the surrounding environment. The broadband multi-frequency omni-directional array antenna comprises a medium material plate (1), radiation units (2), a radiation floor (3) and a feed network (4), wherein the radiation units of the array antenna and the radiation floor of the array antenna are printed on one side of the medium material plate (1), the feed network is positioned on the other side of the medium material plate (1), each radiation unit (2) forms an arm-shaped symmetric dipole structure by an index curve aebx and a broken line, all the radiation units are placed by adopting the way of placing the radiation units in the forward direction and the reverse direction alternately or placing the one half of the radiation units in the forward direction and placing the other half of the radiation units in the reverse direction according to the sequence, the feed network adopts the shunt-feed feed way, and all the radiation units are respectively coupled and excited through a balun on a shunt-feed feed network. The broadband multi-frequency omni-directional array antenna has the advantages of broadband, multi-frequency and omni-directional performance, and can be used as the omni-directional array antenna in an IMT-Advanced system in the field of mobile communication.