Patent ID: 9335359
Filing Date: 2016-05-10
CPC Classification: G01R

Claim Text:
1. A far electromagnetic field estimation method for determining at least either one of an electric field and a magnetic field that are estimated to be formed by a radiation source of an electromagnetic wave at a virtual observation point distant from the radiation source, the radiation source being located in either one of two spaces sectioned by a ground plane, the method comprising: a first step of assuming a measurement surface and setting a plurality of measurement points on the measurement surface, the measurement surface forming a closed surface in combination with the ground plane, the closed surface surrounding the radiation source, the virtual observation point being outside a space formed inside the closed surface; a second step of measuring either a plurality of measurement-point electric fields or a plurality of measurement-point magnetic fields, or both, the plurality of measurement-point electric fields being components of electric fields in tangential directions of the measurement surface at the plurality of measurement points, the plurality of measurement-point magnetic fields being components of magnetic fields in the tangential directions of the measurement surface at the plurality of measurement points; a third step of setting a plurality of mirror image measurement points which have a plane-symmetrical positional relationship with the plurality of measurement points about the ground plane on a mirror image measurement surface which has a plane-symmetrical positional relationship with the measurement surface about the ground plane, and calculating either a plurality of mirror image measurement-point electric fields or a plurality of mirror image measurement-point magnetic fields, or both, on the basis of either the plurality of measurement-point electric fields or the plurality of measurement-point magnetic fields, or both, measured in the second step, the plurality of mirror image measurement-point electric fields being components of electric fields in tangential directions of the mirror image measurement surface at the plurality of mirror image measurement points, the plurality of mirror image measurement-point magnetic fields being components of magnetic fields in the tangential directions of the mirror image measurement surface at the plurality of mirror image measurement points; and a fourth step of calculating at least either one of the electric field and the magnetic field that are estimated to be formed at the virtual observation point, on the basis of either the plurality of measurement-point electric fields or the plurality of measurement-point magnetic fields, or both, measured in the second step, and either the plurality of mirror image measurement-point electric fields or the plurality of mirror image measurement-point magnetic fields, or both, calculated in the third step.