Patent ID: 6691076
Filing Date: 2004-02-10
Classification: G06F

Abstract:
A method of calculating an intensity of an electromagnetic field emitted from a device by using a moment method, comprising:obtaining a plurality of shell elements including at least one triangular shell element by virtually dividing said device into a mesh, wherein a mutual impedance between the plurality of shell elements and a supplied voltage are known values and a current flowing through the at least one triangular shell element is an unknown quantity; and one of: setting an unknown quantity of a current directed from each side of said triangular shell element toward an opposing apex when a conductive wire is connected to said opposing apex, setting an unknown quantity of a current directed from each side of said triangular shell element toward the opposing apex when said side is common with a side of another shell element, and setting an unknown quantity of a current parallel to a side of said triangular shell element when another shell element is adjacent to said triangular shell element, wherein said setting an unknown quantity of a current comprises: selecting a first shell element from said Plurality of shell elements; determining a shape of said first shell element; preparing, when said first shell element is triangular, a first congruent triangle and a second congruent triangle, wherein the first congruent triangle and the second congruent triangle are congruent with said first shell element, yielding three congruent triangles; setting up a first correspondence between a first apex of the first shell element and a first starting point of a first current, a second correspondence between a second apex of the first congruent triangle and a second starting point of a second current, and a third correspondence between a third apex of the second congruent triangle and a third starting point of a third current, wherein each of said first, second and third currents is directed to an outside of a respective congruent triangle of said three congruent triangles, so that, if the three congruent triangles were overlapped, the first, the second and the third starting points, respectively, are not overlapping; selecting, in one of the three congruent triangles, a side opposite to a selected one of said starting points to yield a selected side; judging whether a conductive element is connected to the selected one of said starting points opposite to said selected side; setting, when a conductive element is connected to the selected one of said starting points opposite to said selected side, an unknown quantity of a current directed from said selected side toward said selected one of said starting points; judging, when the conductive element is not connected to the selected one of said starting points of said one of the three congruent triangles, whether a shell element is adjacent to a side other than said selected side of said one of the three congruent triangles; setting, when a shell element is not adjacent to a side other than said selected side of said one of the three congruent triangles, an unknown quantity of a current directed from said selected side toward said selected one of said starting points; setting, when a shell element is adjacent to a side other than said selected side of said one of the three congruent triangles, an unknown quantity of a current parallel to one side of said one of the three congruent triangles in such a way that a current flows into said shell element that is adjacent to the side other than said selected side; and repeating above operations until all sides of said three congruent triangles have been selected.