Omnidirectional High Gain Base Station Antenna

In this paper, a high gain omnidirectional antenna array based on folded dipole is designed. The antenna, operating in the UHF band with its length less than 3m, owns 8 folded dipole units placed vertically to form a linear array in order to realize the omnidirectional characteristics. The antenna is processed and measured. The measurement shows that the omnidirectional antenna array is able to realize a VSWR of less than 1.5, a roundness of the directivity pattern in horizontal plane less than 0.5dB, and a gain of more than 7.0dBi within the working band of a relative bandwidth of 10%. The measured results show that the antenna has good horizontal omnidirectional radiation characteristics in the designed frequency bands, which is in good agreement with the simulation.