同轴线馈电的球面共形微带天线的数值分析

采用基于矩量法(method of moments,MoM)的面线积分方程法分析了同轴线馈电的球面共形微带天线的输入阻抗。面线积分法在分析过程中具有未知量少,计算时间短的优势。天线贴片电流和探针电流分别采用Rao-Wilton-Glisson (RWG)基函数与三角基函数来模拟。在线面连接处,提出一种新型的连接基函数以保证探针与贴片的电流连续性。激励源采用磁流环模型,并且结合球表面磁并矢格林函数求解激励源在天线表面产生的场。最后,通过实例验证了连接基函数的可行性,并分析了两副球面共形微带天线的输入阻抗,证明所提分析处理的正确性。

Numerical analysis of spherical conformal microstrip antenna fed by coaxial line

The input impedance of spherical conformal microstrip antennas fed by the coaxial line is analyzed using the surface-wire integral equation method based on method of moments (MoM). The surface-wire integral equation method has advantages of few unknowns and short calculation time in the analysis process. The equivalent currents on the antenna patch and probe are simulated by the Rao-Wilton-Glisson (RWG) basis function and the triangle basis function respectively. A novel junction basis function is proposed at the junction to keep the current continuity from patch to probe. The field on the surface of the antenna produced by magnetic frill source is calculated based on the magnetic dyadic Green’s functions. Finally, the junction basis function is validated in terms of feasibility, and the input impedance of spherical conformal microstrip antennas are analyzed based on two examples. Calculated results show the validity of the proposed method.