Abstract-A new wideband differentially-fed dual-polarized antenna with stable radiation pattern for base stations is proposed and studied. A cross-shaped feeding structure is specially designed to fit the differentially-fed scheme and four parasitic loop elements are employed to achieve a wide impedance bandwidth. A stable antenna gain and a stable radiation pattern are realized by using a rectangular cavity-shaped reflector instead of a planar one. A detailed parametric study was performed to optimize the antenna's performances. After that, a prototype was fabricated and tested. Measured results show that the antenna achieves a wide impedance bandwidth of 52% with differential SWR<1.5 from 1.7 to 2.9 GHz and a high differential port-to-port isolation of better than 26.3 dB within the operating frequency bandwidth. A stable antenna gain (≈ 8 dBi) and a stable radiation pattern with 3-dB beamwidth of 65°±5° were also found over the operating frequencies. Moreover, the proposed antenna can be easily built by using PCB fabrication technique due to its compact and planar structure. Index Terms-Differentially-fed antenna, wideband antenna, base station antenna, dual-polarization, stable radiation pattern. Ding-Liang Wen was born in Ninghua, Fujian Province, China. He received the B.S. degree in electric science and technology and M.E. degree

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