Finite difference time domain electromagnetic calculation carrier meshing method

Abstract

The invention discloses a finite difference time domain electromagnetic calculation carrier meshing method. According to the method, the mesh size is jointly controlled by the discrete electrical dimensional accuracy and the carrier surface approximation accuracy, the geometrical approximation degree between the divided mesh model and the carrier model is high especially under the situation of low frequency with large wavelength, finite difference time domain electromagnetic calculation is performed on the basis of the mesh model, and the calculation result is relatively accurate; surface approximation accuracy controlling parameters for meshing the mesh model are provided, the blindness of meshing precision control of the conventional direct subdivision method is avoided, and the calculated amount for meshing can be effectively controlled; when mesh refinement is required, all that is needed is to perform octree recursive subdivision to the black nodes in the bottommost layer, and mesh refinement is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic compatibility, and relates to a grid division method for numerical analysis of electromagnetic fields, in particular to a carrier grid division method for time-domain finite-difference electromagnetic calculations, which can be used for research on electromagnetic field calculations by time-domain finite-difference methods. Background technique [0002] With the rapid development of modern science and technology, the carriers of mobile communication systems, such as vehicles, aircraft, and ships, are loaded with various electronic devices with different functions and various antennas for receiving and transmitting signals. Due to various wireless electronic devices and communication The increase in equipment density leads to denser electromagnetic signals between communications, and a gradual increase in frequency spectrum overlap, which makes the electromagnetic environment worse. Issues ...

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Problems solved by technology

It can be seen that the existing research results have the following problems: (1) The accuracy of approximating the surface shape of the carrier is low (especially in the case of low frequency or large wavelength), while the shape of the carrier does not affect the coupling degree between the antennas, the antenna pattern, etc. The parameters have a great influence; (2) Direct subdivision leads to a large amount of calculation for grid division when the grid size is small; (3) When the grid needs to be refined, the existing grid cannot be used for division processing. Instead, the mesh must be re-meshed with the new mesh size or space step

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