An efficient algorithm of the electromagnetic dyadic green's function in a horizontal-layered anisotropic medium

作者：Chen Gui Bo^*; Wang Hong Nian; Yao Jing Jin; Han Zi Ye; Yang Shou Wen

来源：Acta Physica Sinica, 2009, 58(3): 1608-1618.

• high order window function
• continued fraction expansion
• dyadic Green's function
• layered anisotropic medium

In this paper, we advance an efficient algorithm of electromagnetic spatial dyadic Green's function in a horizontal-layered anisotropic medium through high order window function and so on. First, we use the high order window function to transform the Sommerfeld integrals of dyadic Green's function into integrals along a generalized steep descent path. And we give a new and higher order of power series of expansion expression of Hankel transforms of the window function and an accurate formula of Lommel function so that the dyadic Green's function can be precisely computed either near or far from the transmitter. Then, we divide the integral path into a series of subintervals based on the zeros of Bessel function and compute integral per subinterval using an improved adaptive Gauss quadrature. Furthermore, an algorithm of the finite continued fraction expansion is used to sum up the integrals on each subinterval to greatly accelerate the convergence velocity of the numerical integration along the descent path. Finally, our numerical results validated the efficiency of the algorithm.

• 出版日期2009-3
• 单位中国地质科学院地球物理地球化学勘查研究所; 吉林大学