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Size validity of plasma-metamaterial cloaking monitored by scattering wave in finite-difference time-domain method

机译:通过有限差分时域法测定通过散射波监测等离子体超材料粘附的尺寸有效性

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摘要

Limitation of the cloak-size reduction is investigated numerically by a finite-difference time-domain (FDTD) method. A metallic pole that imitates an antenna is cloaked with an anisotropic and parameter-gradient medium against electromagnetic-wave propagation in microwave range. The cloaking structure is a metamaterial submerged in a plasma confined in a vacuum chamber made of glass. The smooth-permittivity plasma can be compressed in the radial direction, which enables us to decrease the size of the cloak. Theoretical analysis is performed numerically by comparing scattering waves in various cases; there exists a high reduction of the scattering wave when the radius of the cloak is larger than a quarter of one wavelength. This result indicates that the required size of the cloaking layer is more than an object scale in the Rayleigh scattering regime.
机译:通过有限差分时域(FDTD)方法数值对斗篷尺寸减少的限制进行了规定。模仿天线的金属杆用各向异性和参数梯度介质覆盖微波范围内的电磁波传播。粘附结构是在由玻璃制成的真空室内被限制的等离子体中浸没过的超材料。平滑介电常数等离子体可以在径向方向上被压缩,这使得我们能够降低斗篷的尺寸。通过比较各种情况下的散射波来数量地进行理论分析;当斗篷的半径大于一个波长的四分之一时,散射波的高减少。该结果表明,粘附层的所需尺寸大于瑞利散射方案中的物体比例。

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