ANALYTICAL TECHNIQUE TO EVALUATE THE ASYMPTOTIC PART OF THE IMPEDANCEMATRIX OF SOMMERFELD-TYPE INTEGRALS

The integral transform method with the asymptotic extraction technique is formulated for calculating a Sommerfeld-type integral problem, Thi s formulation allows the infinite double integral of the asymptotic pa rt of the impedance matrix to be transformed into a finite one-dimensi onal (1-D) integral, This finite 1-D integral contains a spherical Leg endre function and can be easily evaluated numerically after the singu lar part of the integral is performed analytically, It is shown that t he proposed method dramatically reduces the computation time and impro ves the accuracy over the conventional method to evaluate the asymptot ic part of impedance matrix.