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得到了目标坐标系中电流元辐射近场的表达式,验证了该函数的正确性。在目标坐标系中将电流元的辐射近场、散射场等用球矢量波函数展开,利用球矢量波函数的正交性得到了展开系数并给出了其数值结果及物理分析。在天线近场照射下,得到了目标散射场的解析解,对所得结果进行了数值仿真,利用矩量法验证了结果的正确性。结果表明,天线近场照射目标时,目标上的电磁波为TE波和纵波,纵波是目标散射的主要因素,测量角θ对散射的影响较大。该方法可用于其他天线如相控阵天线等照射下目标散射以及目标电磁相互作用等领域的研究。
The expression of the near-field radiation in the target coordinate system is obtained, which verifies the correctness of the function. In the target coordinate system, the radiation near-field and scattering fields of the current element are expanded by the spherical vector wave function. The expansion coefficient is obtained by the orthogonality of the spherical vector wave function. Numerical results and physical analysis are given. The analytic solution of the target scattering field is obtained under the antenna near-field irradiation. The numerical simulation results are obtained and the correctness of the result is verified by the moment method. The results show that the target electromagnetic wave is the TE wave and the longitudinal wave when the antenna is irradiated by the near field. The longitudinal wave is the main factor of the target scattering. The influence of the measuring angle θ on the scattering is large. This method can be used in the field of target scattering and target electromagnetic interaction of other antennas such as phased array antenna.