非均匀等离子体对平面电磁波的衰减
Attenuation of planar electromagnetic waves by inhomogeneous plasma
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摘要: 利用荧光灯排列形成非均匀等离子体层（面积约60 cm×52 cm，消耗功率约400 W），研究了其对1～8 GHz E波（电矢量方向平行于灯轴方向的入射波）的反射和透射的影响。结果表明，该等离子体对1～4 GHz的E波具有强吸收和弱反射的特性，单程衰减最高可达8 dB。利用2维分段线性电流密度递归卷积时域有限差分计算式，模拟了E波传播及其在非均匀等离子体内推进的瞬态过程，计算了等离子体对电磁波的反射和透射衰减，并与实验结果拟合，得到等离子体电子数密度峰值约9.72×1016 m-3-3，电子与中性粒子碰撞频率约4 GHz。Abstract: Based on the possible application of low power, large area, inhomogeneous plasma to radar stealth, many standard commercial fluorescent lamps placed directly against each other were used to produce a inhomogeneous plasma layer (area 60 cm×52 cm, power 400 W). The reflection and transmission of E-waves (electric field of the waves was parallel to tube axis ) in the frequency range of 1 to 8 GHz were investigated both experimentally and numerically. The strong absorption and weak reflection of E-waves were observed near 1 to 4 GHz, and the one-way attenuation trended to a peak of 8 dB. The two-dimensional piecewise linear current density (JE) recursive convolution finite-difference time-domain (PLJERC-FDTD) algorithm was applied to simulate the transient progress of E-waves traveling throug
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Key words:
- plasma /
- electromagnetic wave /
- stealth /
- finite-difference time-domain /
- attenuation
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