Fdtd Simulation Of Microwave And Laser Plasma Interaction

Plasma Stealth is a technology which uses plasma to evade the detectionof radar system. It is important to know the interaction between plasma andmicrowave to Plasma Stealth Technology. Analytical method and numericalmethod are both included in the study of the interaction between plasma andmicrowave. FDTD, finite-difference time-domain method, is the most widelyused numerical method in the study of microwave. Experiments indicated thatlaser plasma can shield microwave effectively. Hence, several modelsaccording to the traits of laser plasma were designed. A one dimensionPLRC-FDTD arithmetic written by VC++ was programmed to simulate andcalculate the transmitting, reflection, refraction and absorb of microwavesin laser plasma. Some results get from numerical calculation: (1)distribution of electric field of microwaves in different plasma model, indifferent time steps; (2) the reflection coefficients of spectrum indifferent plasmas; (3) the transmission coefficients of spectrum indifferent plasmas. Some results can get from the contrast: (1) reflectionand transmission electric fields of the simplified axial laser plasma andexpanding simplified axial laser plasma are both small; (2) the simplifiedaxial laser plasma reflects less microwave in the lower frequency; (3) whenboth Collisional Frequency and Plasma Frequency are 50GHz, the unsymmetricalradial laser plasma reflects less microwave in the higher frequency withan attenuation of about -40dB;(4) when both Collisional Frequency and PlasmaFrequency are 50GHz, the simplified axial laser plasma and the unsymmetricalradial laser plasma both strongly attenuate transmission microwaves witha wave band from 0 to 100GHz.