Abstract
The basis of plasma stealth technology is the attenuation of electromagnetic waves by plasma. In this study, the calculation principle of the finite-difference time-domain (FDTD) method is introduced and a FDTD time–space coupling model of electromagnetic wave propagation in plasma is established. The time-domain variation characteristics of electromagnetic waves entering the plasma are analyzed. The plasma parameter distribution under different conditions obtained using the COMSOL fluid mechanics model is introduced into the FDTD model. The plasma reflectivity measurement experiment was carried out in a microwave anechoic chamber, and the influence of different experimental conditions on the plasma reflectivity was analyzed. The variation of reflectivity under different plasma parameter distributions is obtained. The results show that increasing electron density and plasma thickness and enhanced plasma distribution uniformity are beneficial for improving the attenuation effect of plasma on electromagnetic waves. These results provide a reference for the inductively coupled plasma parameter distribution in a closed quartz cavity, which provides a basis for the plasma to attenuate the electromagnetic waves.
Highlights
The absorption characteristics of electromagnetic waves and the reflection and refraction of plasma are the basis of plasma stealth.1 The publication of Swarner’s research results confirmed for the first time that plasma can effectively reduce the radar cross section (RCS) of a target.2 The Hughes Laboratories in the USA used a plasma in a ceramic hood to attenuate the RCS of a target by 20–25 dB3 in a specific frequency band
The plasma parameter distribution under different conditions obtained using the COMSOL fluid mechanics model is introduced into the finite-difference time-domain (FDTD) model
The results show that increasing electron density and plasma thickness and enhanced plasma distribution uniformity are beneficial for improving the attenuation effect of plasma on electromagnetic waves. These results provide a reference for the inductively coupled plasma parameter distribution in a closed quartz cavity, which provides a basis for the plasma to attenuate the electromagnetic waves
Summary
The absorption characteristics of electromagnetic waves and the reflection and refraction of plasma are the basis of plasma stealth. The publication of Swarner’s research results confirmed for the first time that plasma can effectively reduce the radar cross section (RCS) of a target. The Hughes Laboratories in the USA used a plasma in a ceramic hood to attenuate the RCS of a target by 20–25 dB3 in a specific frequency band. The publication of Swarner’s research results confirmed for the first time that plasma can effectively reduce the radar cross section (RCS) of a target.. The Hughes Laboratories in the USA used a plasma in a ceramic hood to attenuate the RCS of a target by 20–25 dB3 in a specific frequency band. Vidmar et al conducted an experiment in which electromagnetic waves interacted with electron beam plasma. The working gas was helium, and the electromagnetic wave frequency was 0.1–10 GHz.. There have been experiments that directly measured the attenuation rate of electromagnetic waves by inductively coupled plasmas (ICPs) in different angular domains.. Due to the limitations of time-domain resolution, the details of the effect of ICP on electromagnetic wave propagation and the spatiotemporal evolution process of scattering effects cannot be obtained The working gas was helium, and the electromagnetic wave frequency was 0.1–10 GHz. There have been experiments that directly measured the attenuation rate of electromagnetic waves by inductively coupled plasmas (ICPs) in different angular domains. due to the limitations of time-domain resolution, the details of the effect of ICP on electromagnetic wave propagation and the spatiotemporal evolution process of scattering effects cannot be obtained
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