馈线不平衡效应对平面准各向同性磁偶极子天线辐射性能影响研究

Unbalanced cable effect on planar quasi-isotropic magnetic dipole antennas

提出同轴线表面不平衡电流的分析方法。根据同轴线和平面磁偶极子天线的连接关系及其固有边界条件,同轴线外表面不平衡电流产生的寄生辐射分量,可用两个高阶谐振电偶极子模式的辐射来近似展开。结合数值分析以及两种平面磁偶极子天线样品的实测比较,发现扣除同轴电缆的寄生辐射效应后,实测和仿真的平面磁偶极天线方向图吻合度可提高20%左右。该方法可用于平面磁偶极子天线实测方向图的数值校准。

This paper analyzes the unbalanced sheath currents of coaxial lines. The parasitic radiation component generated by the unbalanced sheath current of a coaxial cable can be approximately expanded by the radiation of two high-order resonant electric dipole modes, based on the connection between the coaxial line and the planar magnetic dipole antenna, and their inherent boundary conditions. Two kinds of planar magnetic dipole antenna samples are measured and compared with the numerical analysis. After deducting the parasitic radiation of the coaxial cable, the coincidence between the measured and simulated planar magnetic dipole antenna patterns can be improved by about 20%. This method can be used to calibrate the measured pattern of planar magnetic dipole antennas.