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本文从导电园柱体对电磁渡的绕射研究,推广至介质园柱体,分别对kα=0.59及kα=2.35(α为园柱体半径,k为波数)的聚苯乙烯圆柱体,逐项计算散射场。计算表明,对于kα=0.59的情况,在实验精确度范围内,只要计算零次项。对于kα=2.35的情况,需要计算至三次项,其中主要贡献是一次项,它约为零次项与二次项的一倍,三次项则贡献最小(约只占5%)。这说明代表散射场的级数收敛得比较快,这种方法可以用来研究其它不同材料的介质产生的绕射场,并分析它的物理特征,为在实验模拟实际障碍物对于天线和电磁场的影响提供一种研究方法。实验上用双平面系统对上述介质园柱体和相应的导电园柱体进行比较[1];结果表明,在理论与实验的符合程度上双平面系统的测量结果要比单平面系统好得多。
In this paper, we study the diffraction of electromagnetic transition from a conductive cylinder to a dielectric cylinder. For a polystyrene cylinder with kα = 0.59 and kα = 2.35 (α is the cylinder radius and k is the wave number) Calculate the scattering field. Calculations show that for the case of kα = 0.59, within the experimental accuracy range, only the zero-order term is calculated. For the case of kα = 2.35, the third term needs to be calculated. The main contribution is the first term, which is about twice the zero order and the second order, while the third term contributes the least (about 5%). This means that the series representing the scattering field converges relatively quickly. This method can be used to study the diffraction field generated by the medium of different materials and to analyze its physical characteristics. In order to simulate the actual obstacles for the antenna and the electromagnetic field Impact provides a research method. Experimentally, a dual-plane system is used to compare the above-mentioned media cylinder with the corresponding conductive cylinder [1]. The results show that the biplane system is much better than the single-plane system in theoretical and experimental conformance .