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对于边缘绕射问题,几何绕射理论法的计算时间虽不长,但在散焦区得出结果发散。如用等效边缘电流的积分公式进行计算,其计算时间则太长。本文对导电截锥缝隙源激励情况下的等效边缘电流的积分公式,采用了驻相法作渐近计算,得出相应各区域的驻相法计算公式,特别是阴影边界邻域,考虑到跃变点的影响,本文作了相应的数学处理,得到了合理的结果。等效边缘电流驻相法计算的数值结果与积分的数值结果符合得很好。而前者的计算时间约为后者的十分之一。本文还将等效边缘电流驻相法计算的结果与实验测试结果进行了比较,两者吻合情况较好。
For the edge diffraction problem, the calculation method of the geometric diffraction theory is not long, but the result is divergent in the defocused area. If using equivalent edge current integral formula to calculate, the calculation time is too long. In this paper, the integral formula of equivalent edge current in the case of conductive truncated cone gap source excitation is obtained by the asymptotic calculation of the phase-in method, and the formulas of the phase-in method in each region are obtained, especially in the neighborhood of the shadow boundary, The impact of transition point, the paper made the corresponding mathematical treatment, and obtained reasonable results. The numerical results of the equivalent edge current in phase method agree well with the numerical results of integral. The former calculation time is about one-tenth of the latter. In this paper, the equivalent edge current method in the calculation of the results with the experimental test results were compared, the agreement between the two is better.