Antenna multipole weight expansion near-field measurement method based on electric field distribution

The invention discloses an antenna multipole weight expansion near-field measurement method based on electric field distribution, and the method comprises the steps: carrying out the multipole plane wave expansion of a to-be-measured antenna, and obtaining the directions of a group of multipole plane wave weights; performing planar near-field measurement to obtain a group of near-field measurement data; determining the type of the sampling point according to the electric field amplitude of the sampling point; the categories comprise strong points, secondary strong points and weak points; for each strong point and each secondary strong point, adding a new sampling point in a self area according to a corresponding encryption mode, so that the total number of the sampling points reaches the number of multi-pole plane wave expansion; performing planar near-field measurement on the to-be-measured antenna according to the position coordinates of all the newly added sampling points; and constructing a measurement ma