18单元线极化径向线阵列天线优化及实验研究

摘要

为了改善18单元线极化径向线阵列天线的辐射性能,通过改变子阵馈电网络封口形状并优化馈电探针、改进单元天线和适当减小阵列天线单元间距3种方法,对阵列天线进行优化,对反射特性和辐射特性进行理论分析、数值仿真和实验研究.仿真结果表明:中心频率1.57 GHz上的反射系数为0.067,增益为18.73 dBi,轴比为-39.82 dB；在1.43～1.76 GHz范围内,反射系数小于0.15.实验结果表明:中心频率1.57 GHz上的驻波比为1.19(对应的反射系数为0.087),增益为17.65 dBi,轴比为-39.2 dB；在1.47～1.77 GHz范围内驻波比小于1.4(对应的反射系数为0.17).仿真结果与实验结果相符.%In order to improve the performance of a 18-element linearly-polarized waveguide array antenna, three methods were used to optimize the array antenna, including changing the the feeding network's seal shape for the array unit and optimizing the feeding probe, improving the cell antenna, and reducing the space between two cell antenna. Then, theoretical analysis, numerical simulation and experimental measurement of this radial line helical array antenna were carried out. The results of simulation show that at the centric frequency of 1.57 GHz, the reflectance is 0. 067, the gain is 18.73 dBi, and the axial ratio is -39.82 dB; in the frequency range from 1.43 to 1.76 GHz, the reflectance is below 0. IS. The experimental measurement shows that at 1.57 GHz, the voltage standing wave ratio (VSWR) is 1.19 (the corresponding reflectance is 0.087), the gain is 17.65 dBi, and the axial ratio is -39. 2 dB; in the frequency range from 1.47 to 1.77 GHz, the VSWR is below 1.4 (the corresponding reflectance is 0.17). Therefore, the simulation results agree with the experimental results well.