A Broadband Dual-Polarized Base Station Antenna With Anti-Interference Capability

A broadband dual-polarized antenna with antiinterference capability is presented in this letter for base station applications. The proposed antenna contains three parts: main radiator, feed structures, and reflector. Specifically, the main radiator has two crossed dipoles to realize +/- 45 degrees polarizations; two vertical substrates, which have Gamma-shaped feeding lines on the front side and rectangle patches on the back side, are placed between the main radiator and reflector for feeding; the reflector placed below is used to get high gain and unidirectional radiation. In addition, C-shaped stubs are arranged next to the feeding lines in order to filter the unwanted frequency band. A prototype of the antenna was fabricated and tested. The measured results show that it has a bandwidth of 52.6% (VSWR < 1.5) along with a sharp notch band from 2.27 to 2.53 GHz. Measured isolation of higher than 25.4 dB, half-power beamwidth of around 60 degrees and average gain of 7.57 dBi across the operating band are also obtained. Having the advantages of anti-interference capability, dual polarization, wide bandwidth, high isolation, and good radiation performance, the proposed antenna can find its application in the next-generation wireless communication systems.