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提出了一种应用于基站的双波束透镜天线。其中透镜采用恒介电常数的介质制成,形状为介质分层嵌套的圆环柱体。其分层的方法是采用改进的等间距分层法,利用相邻介质层的介电常数等效分界点的介电常数。透镜采用分块放置的形式,不仅可以实现能量聚焦,提高增益,同时还改善了天线交叉极化的指标。此透镜天线采用对称的两列天线从下方馈电,从而在单扇区内实现双波束。通过专业电磁仿真软件Ansoft HFSS建模仿真,结果显示,在1.71~2.17 GHz的宽频带范围内,该双波束透镜天线具有良好的方向图性能。
A dual-beam lens antenna applied to base station is proposed. Among them, the lens is made of a medium of constant dielectric constant, and the shape is a ring cylinder in which the medium is layered and nested. The method of layering is to use the improved equal-interval layering method to utilize the permittivity of the equivalent dielectric point of the dielectric constant of the adjacent layer. The lens is placed in a block, not only to achieve energy focus, improve gain, but also improve the antenna cross-polarization index. This lens antenna uses two symmetrical two-wire antennas to feed from below to achieve dual beams within a single sector. Through the simulation of the Ansoft HFSS, a professional electromagnetic simulation software, the results show that the dual-beam lens antenna has good performance in the wide frequency range from 1.71 to 2.17 GHz.