Simulation Analysis Of Low-Pressure Microwave Gas Discharge And Its Application In High-Power Microwave Limite

With the continuous innovation and improvement of electronic information systems,the power that can be transmitted by electronic devices is gradually increasing.For high power microwave transmission,we need to consider not only the transmission characteristics,but also the damage caused by the back-end devices due to high pulse.Based on the reflection of electromagnetic waves by plasma formed by low-pressure gas discharge and the absorption of electromagnetic waves,the plasma limiter with dielectric window structure is studied in this paper.Then,for the defects of the plasma limiter protection,it will be able to select the limiter cascade into the system as the latter level of protection to enhance the protection performance.This paper firstly illustrates the numerical analysis method(Spectral Element Time-Domain,SETD)used,which combines the characteristics of flexible finite element modeling and high accuracy of spectral methods through the formation process of basis functions.Since it uses the mass array as its block diagonal matrix,it is convenient,fast and efficient to evaluate the inverse.Then,the Maxwell equation system-based formulation is derived using the time-domain spectral element method,and the required source addition method and boundary conditions are explained.Besides,the electromagnetic-plasma interaction mechanism is analytically explained and the basic properties of the plasma are outlined.After that,a numerical analysis platform based on the coupling of Maxwell’s and electrofluidic equations is analyzed to study the electric field,electron density and temperature as a function of time during high-power microwave breakdown by means of the time domain.Some specific arithmetic examples are combined to verify the correctness of the algorithm-based platform,and then the influence of different parameters on the high-power microwave gas breakdown effect is analyzed,and the gas thermal effect is studied.Moving on,the mechanism of the plasma limiter is briefly described in the paper.In order to ensure that the plasma limiter is applicable to both high and low power,and then different methods are used for comparison and verification in the low power case.At the same time,the gas in the plasma limiter in practical situations needs to be blocked by a dielectric on both sides of it to prevent escape,so the protection performance of the plasma limiter under the action of high power is analyzed by using the dielectric window calculation to highlight the effectiveness of the plasma limiter working under high power microwaves.Considering the possible power leakage problem of plasma limiter,the idea of cascade type limiter is proposed.The energy-selective limiter is first introduced by using a simple example of frequency-selective surface and energy-selective surface,and then by combining the plasma limiter and the energy-selective limiter into one,thus constituting a cascaded limiter,which not only compensates for the leakage of the plasma limiter,but also solves the problem of insufficient power capacity of the energy-selective limiter.