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针对室内壁挂基站应用要求,采用对称角形缝隙加载正方形贴片,实现具有电下倾辐射特性的低剖面宽带贴片天线结构。实验结果表明,设计天线S11参数小于-10dB的相对阻抗带宽为5.15%。在工作频带内,天线辐射场可产生约30°的下倾角。并且可通过馈电位置的改变,实现辐射场下倾角的调整。水平平面辐射方向图表明,在120°范围内,其垂直极化辐射场要比水平极化高10dB以上,表明天线具有良好的垂直线极化特性。工作频带内天线的增益约为6dBi。该天线可内置于壁挂基站以减小设备尺寸。
According to the application requirements of indoor wall-mounted base station, square patch is loaded with symmetrical angular slit to realize the low-profile broadband patch antenna structure with electrical dip-down radiation characteristics. Experimental results show that the relative impedance bandwidth of less than -10dB for the designed antenna S11 is 5.15%. In the operating band, the antenna radiation field can produce a downtilt of about 30 °. And through the change of the feeding position, the adjustment of the inclination of the radiation field can be realized. The horizontal plane radiation pattern shows that the vertically polarized radiation field is more than 10 dB higher than the horizontal polarization within the range of 120 °, indicating that the antenna has good vertical line polarization characteristics. The gain of the antenna in working frequency band is about 6dBi. The antenna can be built-in base stations to reduce the size of the device.