The scattering features of microwave by inhomogeneous plasma column have been studied numerically by the Finite-difference-time-domain(FDTD) method and experimentally.The effects of the plasma frequency and electron collision rate on microwave's reflectance, transmittance and absorptance were tested.The results show the plasma column with plasma density of non-uniform distribution can make the scattering wave shift away from 0 to a side-angled direction.The electron density and the collision rate play an important role in the reduction of the wave reflection.The plasma density should be appropriate, even be lower than the critical value corresponding to the microwave, so that the microwave can reduce greatly in reflectance due to the strong scattering or absorption.%模拟和实验研究了非均匀圆柱形等离子体及阵列对微波的散射作用.利用有限时域差分(FDTD)方法仿真得到了等离子体柱的密度、碰撞频率对微波传播系数的影响,并利用低气压放电产生的等离子体柱对微波的吸收和散射作用进行了验证.结果表明:电子密度中心高、周围低的非均匀等离子体柱可将微波散射至两个侧向;等离子体频率越大,散射的微波功率越强;增加碰撞频率使等离子体柱的微波散射功率减小、吸收增大.等离子体必须具有合适的密度,才能对微波反射产生较大影响.
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