Antenna radiation calculation method based on spherical wave expansion and source reconstruction

Abstract

The invention provides an antenna radiation calculation method based on spherical wave expansion and source reconstruction. The antenna radiation calculation method comprises the following steps: firstly, by using a spherical wave expansion method, only radiation fields of a small number of sampling points on the sampling spherical surface with a large radius are needed, and then the radiation field of any point on the data spherical surface with a small radius can be calculated by calculating the radiation field of any point on the data spherical surface, and then the equivalent source distributed on the Huygens surface is reconstructed by utilizing the calculated radiation field on the data spherical surface, and finally, the radiation field actually generated by the antenna to be measured in the space is obtained by calculating the radiation field generated by the equivalent source in the space. According to the antenna radiation calculation method, a spherical wave expansion methodand a source reconstruction method are combined by introducing a data spherical surface; and the antenna radiation calculation method gives full play to the advantages of few sampling points and small calculation amount of a spherical wave expansion method and the advantages of large calculation area and high applicability of a source reconstruction method, and is used for solving the problems that part of areas of the spherical wave expansion method cannot be calculated and the source reconstruction method is overlarge in calculation amount and overlong in calculation time.

Description

technical field [0001] The invention relates to the field of computational electromagnetics, in particular to an antenna radiation calculation method based on spherical wave expansion and source reconstruction. Background technique [0002] In antenna testing, in order to make the antenna meet the requirements of the application scenario, it is always hoped to know the electromagnetic radiation generated by the antenna, so as to further improve and optimize the antenna. In order to obtain the electromagnetic radiation generated by the antenna in the surrounding space, the most direct method is to sample and measure the electromagnetic field in the space at a certain interval, so as to obtain the electromagnetic field distribution in the entire space. However, the disadvantage of direct measurement is very obvious, which requires a lot of labor cost and time cost, and the electromagnetic field of the unsampled point can only be approximated by interpolation, which may have a ...

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Problems solved by technology

The disadvantage of the source reconstruction method is that the amount of calculation is large. When the size of the antenna to be tested is large or the distance between the sampling surface and the antenna is long, the amount of data is very large, the calculation time is very long, and the computer needs a large memory. The feasibility of the method is not high

[0005] It can be seen that the traditional methods have certain limitations. The spherical wave expansion method cannot obtain the electromagnetic field distribution in the smallest sphere, and the source reconstruction method cannot deal with large-scale problems. In the actual antenna test, these two methods are difficult to meet need

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