Research On Application Of Random Coupling Model In Different Scenes

High Power Microwave is acted as electromagnetic interference source in engineering wildely with the complexity of electromagnetic environment.In order to provide proper electromagnetic environment for electronic devices,metal shielding cavity is always equipped for them to reduce outer electromagnetic interference.In order to facilitate the line,keep ventilation and heat dissipation,and save materials,the metal shielding cavity usually opens a hole seam.High power microwave has the characteristics of high power and high frequency,so high power microwave is easy to penetrate through the hole,and it enters into the cavity through the "back door coupling"mode,which has an impact on the safety and stability of the electronic equipment inside.In recent years,due to the rapid development of microelectronics technology,the integration of electronic equipment is becoming more complex and the high power microwave sensitivity is lower,so in the practical,research of application of the electromagnetic coupling effects on the metal shielding cavity is of great significance.In the practical,the internal structure of the metal shielding cavity is more complex,and its length belongs to electric large size compared to the high frequency electromagnetic wave size.It can be regarded as a complex lossy wave chaotic cavity,so in this paper,Random Coupling Model(RCM)can be used to research the electromagnetic coupling effect of the cavity.First of all,we proposed a cascaded double cavity model,and combined the random coupling model and network cascade theory to deduce the calculation method of induced voltage of double cavity target point.We set up the experimental platform to get the experimental data and draw the comparison graph of probability density function(PDF)of induced voltage at target point obtained by this method and by other methods to prove the effectiveness of this method.Then,we analyzes and forecast the damage probability of electronic circuit in complex single cavity by using RCM and verify its applicability through experiments under radiation of the plane wave power and the Gauss pulse.Finally,we put forward the reverberation chamber model duced to the physical prototype of of substation protection small-room.We simulate its physical quantities needed by electromagnetic simulation software and calculate the induced voltage at the target point using RCM,then compare its PDF of induced voltage with the simulation to verify the applicabilty of RCM in the assessment of electromagnetic coupling effect in substation protection small-room.The conclusions of this paper can provide guidance for electromagnetic compatibility,electromagnetic effect evaluation,electromagnetic protection and electromagnetic reinforcement in large-scale irregular electronic systems.