Waveguide device microwave gas discharge numerical simulation method

Abstract

The invention discloses a waveguide device microwave gas discharge numerical simulation method. According to the method, a microwave gas discharge fluid model in a waveguide structure is built, accurate numerical analysis is performed on electron density, electron fluid velocity and average electron energy during gas breakdown, and accordingly, the law of changing of the electric field intensity and the electron density at different observation positions along with the time in the condition of gas discharge of waveguide devices in different geometric profile complicated structures. The modeling of waveguide devices in any complicated structures can be achieved based on the time domain spectral element method; the generated mass matrix is a block diagonal matrix, and an inverse matrix can be obtained directly, so that the calculation time is reduced greatly; meanwhile, by the aid of the numerical simulation method, the breakdown threshold obtained through electric field distribution and electron density inside the waveguide devices through repeated experiments can be prevented, and accordingly, the design period is shortened, the design cost is saved, and the method is quite applicable to effective simulation design and numerical simulation of waveguide devices with discontinuous structures.

Description

technical field [0001] The invention belongs to the simulation technology of electromagnetic characteristics involving multiple physical fields, in particular to a novel numerical simulation method for analyzing gas discharge breakdown of waveguide structure microwave devices. Background technique [0002] With the rapid development of space technology, the circuit integration of electronic equipment is getting higher and higher, and the operating frequency of microwave devices is constantly increasing; at the same time, with the continuous maturity of high-power pulse generator technology, its output power can reach the order of tens of Gw. The numerical analysis and computer simulation of the microwave breakdown and gas discharge phenomena of microwave devices with different gas-filled space waveguide structures are increasingly valued by scientific research institutions, and it is one of the hot problems in the field of space technology and high-power pulses. The research...

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Problems solved by technology

Compared with the long period and high cost of the experimental method, the prediction by the numerical method faces difficulties such as complex structure of the solution object, high nonlinearity, long calculation time and low calculation accuracy.

[0003] At present, the analysis method of microwave breakdown and gas discharge mainly adopts the time-domain finite difference method in the differential equation method, such as literature 1.Yee, Jick H., et al, "Propagation of intense microwave pulses in air and in a waveguide , "IEEE Transactions on Antennas and Propagation, 39.9 (1991), pp:1421-1427. and finite volume integration method, such as literature 2.Adnane Hamiaz, et al," Finite Volume Time Domain modeling of microwave breakdown and plasma formation in a metallic aperture, "Computer Physics Communications 183(2012), pp:1634–1640. The above-mentioned published documents are all used to analyze the two-dimensional gas discharge problem with simple structure, although the numerical distribution and Prediction, but there are disadvantages such as simple model, low accuracy, and long calculation time

At present, there are no literature reports on the simulation of gas discharge phenomena in waveguide structures using the time-domain spectral element method

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