Finite element simulation method capable of removing microwave tube high-frequency circuit in pseudo-DC mode

Abstract

The invention relates to a finite element simulation method capable of removing a microwave tube high-frequency circuit in a pseudo-DC mode, comprising the flowing steps: (A) using a zero electric displacement vector as an electric field constraint equation and acquiring an integrated form of the electric field constraint equation according to an boundary value problem of an electromagnetic field in a microwave tube high-frequency circuit and acquiring a functional equation of the boundary value problem of the electromagnetic field through a standard variation principle of a finite element method; and (B) necessarily ensuring the match between grids on a main surface and grids on a secondary surface on a peripheral boundary when solving a solution domain and considering a pseudo-periodic boundary condition by adopting a dissection solution domain of tetrahedral grids. The invention has the advantages that the finite element simulation method can greatly improve the accuracy, the efficiency and the robustness of microwave tube high-frequency system simulation.

Description

technical field [0001] The invention belongs to a three-dimensional electromagnetic field numerical solution technology, in particular to a finite element simulation method of a microwave tube high-frequency circuit capable of removing a pseudo-DC mode. Background technique [0002] As an important military and civil electronic device, microwave tube is the "heart" of radar and communication system equipment, and is widely used in high-power centimeter-wave and millimeter-wave radar, satellite broadcasting, military electronic communication, electronic countermeasures, plasma Diagnostics, industrial heating and other fields. In high-power radar, electronic countermeasures equipment and high-power communication systems, microwave tube devices have an irreplaceable role. [0003] Before making the tube, the computer-aided design and analysis of the components and the whole tube of the microwave tube plays a very important role in shortening the development cycle, reducing the...

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Problems solved by technology

Iterative methods for solving deterministic problems with large sparse ill-conditioned matrices are difficult to converge

Fast multi-wave front triangular matrix decomposition (LU decomposition) can solve the deterministic problem of this large sparse ill-conditioned matrix, but as the matrix dimension increases, the time and memory consumed by fast multi-wave front triangular matrix decomposition (LU decomposition) method rapidly increasing

Therefore, this scheme has the following defects: 1) the pseudo-DC mode in the finite element simulation of the microwave tube is not removed in essence; 2) limited by the dimension of the finite element matrix, it cannot be efficient for large-scale microwave tube high-frequency circuits with complex geometric structures simulation

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