High-gain broadband omnidirectional antenna

The invention belongs to the technical field of design for antennas, and relates to a high-gain broadband omnidirectional antenna. The high-gain broadband omnidirectional antenna comprises a monopole, a reflector plate, a matching platform and a coaxial cable. The matching platform is in the shape of a circular truncated cone with lower end face open and inside hollow, and a circular hole is arranged on the upper end face of the matching platform. The monopole is cylindrical, the lower half portion of the monopole is disposed in the circular hole of the matching platform, and the upper half portion of the monopole exposes from the upper end face of the circular hole. The circular reflector is arranged above the monopole, the diameter of the reflector plate is equal to that of the lower end face of the matching platform, the reflector plate and the matching platform are concentric and arranged at positions corresponding to each other up and down. The coaxial cable is arranged below the monopole, and the coaxia