一种高性能宽带双频嵌套基站天线

A High-performance Broadband Dual-frequency Nested Base Station Antenna

针对基站天线宽带和多频段的需求,提出了一种新的宽带双频嵌套基站天线。天线由矩形结构的低频辐射单元和嵌套其内由介质支撑座托起的高频辐射单元组成,高低频间绝缘,减少频段间耦合。低频辐射单元通过振子臂末端垂直段的设计能拓宽振子带宽,减小尺寸,通过引入金属支撑柱能拓宽巴伦的平衡带宽,实现宽带平衡馈电的低频辐射单元。仿真结果表明,所设计的天线工作带宽覆盖698~960 MHz,1 710~2 170 MHz,且波宽、轴向交叉极化、驻波等指标均达到预期。

A new broadband dual-frequency nested base station antenna is proposed to meet the needs of broadband and multi-frequency bands for base station antennas.The antenna is composed of a low-frequency radiating unit with a rectangular structure and a high-frequency radiating unit nested inside it supported by a dielectric support base,which is insulated between high and low frequencies to reduce coupling between frequency bands.The low-frequency radiation unit can widen the bandwidth of the vibrator and reduce the size through the design of the vertical section at the end of the vibrator arm.By introducing a metal support column,the balanced bandwidth of the balun can be widened,and a low-frequency radiation unit with broadband balanced feeding can be realized.The simulation results show that the designed antenna’s operating bandwidth covers 698~960 MHz,1 710~2 170 MHz,and the indicators such as wave width,axial cross-polarization and standing wave all meet expectation.