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Accuracy improvement using a modified Gauss-quadrature for integral methods in electromagnetics

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4 Author(s)
Schlemmer, E. ; Inst. for Fundamentals & Theory in Electr. Eng., Graz Univ., of Technol., Austria ; Steffan, J. ; Rucker, W.M. ; Richter, K.R.

A Gaussian quadrature technique for evaluating shape-function-boundary-element kernel produce integrals over three-dimensional isoparametric boundary elements is presented. The procedure allows the integration of singular kernels of O(1/r) on curved surfaces. The integration of the normal derivative of Green's function is also possible. Integrals which exist in the sense of Cauchy principal values are dealt with using the addition-subtraction technique. The accuracy of the numerical integration scheme is compared with that of the double exponential formula and the subdivision technique. Some examples show the effectiveness of the procedure

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Magnetics, IEEE Transactions on  (Volume:28 ,  Issue: 2 )