2D simulation of the electromagnetic wave across the non-uniform reentry plasma sheath with COMSOL

Abstract

The simulation of the electromagnetic wave propagation plays an important role in solving the communication blackout issue. Finite element analysis software package COMSOL is employed by us to model the electromagnetic wave propagation in the presence of the non-uniform reentry plasma sheath in this paper. The propagation characteristics of the electromagnetic wave are analyzed by the observation of the field distributions. The electromagnetic wave with s polarization begins to attenuate as an exponential function at the cut-off position. The mode conversion takes place for the p polarization wave when the real part of the plasma permittivity is close to 0. The wave reflection, transmission, and absorption coefficients as a function of the frequency are calculated and analyzed. The absolute agreements between the results calculated by COMSOL model and by the layered model are achieved. The difference of the coefficients between s and p polarization waves can be explained by the presence or absence of the mode conversion. Conclusions in this paper can be the foundation to employ the COMSOL to study the interactions between the electromagnetic wave and the plasma.

Simulation: Early Detection of Brain Vessels Stroke by Applying Electromagnetic Waves Non-Invasively

“…Based on the shortcomings in the current methods of stroke detection and identification, the use of a scenario in a non-intrusive manner was addressed by designing our simulation model, then, applying electromagnetic waves [18,19], and measuring the change in results according to the three scenarios. The model was designed-figure 1, using laminar flow [20][21][22][23] to represent the blood flow in venous, in normal Scenario, blood clotting in ischemic Scenario 2 through 3 positions, and vessel cut in hemorrhagic Scenario 3 through 9 positions.…”

Energy dissipation and power deposition of electromagnetic waves in the plasma sheath

“…where θ is the incident angle of the EMW. The EMW resonance phenomenon in the plasma has been discussed in reference [24] and can be summarized as a sentence: p polarization EMW with oblique incidence can resonate with electron plasma when the condition of f=f pe is satisfied in some local plasma regions. The preliminary knowledge here will be helpful to explain the characteristics of EMW power deposition in the plasma sheath.…”

“…As an important supplement, COMSOL Multiphysics software can be used to analyze the physical effects, such as EMW cutoff and resonance in the plasma. Previously, we used COMSOL to analyze EMW field distributions [24] and the spatial dispersion effect [25] in a nonuniform plasma sheath. In this work, we will apply COMSOL to research EMW energy dissipation and power deposition in a nonuniform plasma sheath.…”

Loss Simulation Analysis and Experimental Verification of Porous Fe3O4 Electromagnetic

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“…Zhang used COMSOL to simulate the propagation of EMWs in the presence of a nonuniform plasma sheath layer. They calculated and analyzed the laws of reflection, transmission, and absorption coefficients with frequency . Tanikonda used COMSOL to simulate and calculate the shielding effectiveness (SE) of carbon nanofiber-based epoxy nanocomposites .…”