用微分边缘绕射系数法计算多边形平板的散射远场

本文根据微分长度绕射系数法的思想,采用适于任意观察方向的等效电流的严格渐近表达式,推导得到了可有效地表示有边缘理想导体散射远场与入射场之间关系的微分边缘绕射系数。文中采用微分边缘绕射系数计算了几种不同形状的理想导体平板的雷达散射截面,获得了与实验结果相吻合的计算结果,并且在工程计算的实用性方面显示出了优越性。

On Incremental Edge Diffraction Coefficients

The method for calculating the high-frequency electromagnetic scatteringfield has been much developed recently. Michaeli made a big advance withhis model of equivalent edge currents which can be used to compute theelectromagnetic diffraction with arbitrary combination of incident directionand scattering direction from a perfectly conducting body with edges 7-10].But computations based on Michaeli's model are rather tedious to be used inengineering. In order to obtain a less tedious engineering method, the authors go backto Mitzner's paper published in 19746]. It is found that Mitzner's idea ofrelating explicitly scattering field to incident field with coefficients is veryuseful. When Mitzner's idea is combined with Michaeli's model, incrementaledge diffraction coefficients (IEDC), which make computations much easier,are derived. Sikta gave experimental data for scattering from perfectly conductingpolygonal plates5]. The authors IEDC Method can give computed resultsthat agree well with such experimental data. The authors IEDC method can also deal with corner diffraction andcurved edge diffraction.