毫米波与太赫兹波在等离子体中传输特性

针对黑障区高速飞行器测控通信研究需求，在激波管设备上开展了Ka波段毫米波与太赫兹波在等离子体中传输特性的实验研究，获得了不同电子密度和碰撞频率的等离子体中传输衰减特性实验数据。采用辅助差分方程的时域有限差分（ADE-FDTD）方法对实验进行了数值模拟，数值模拟结果和实验结果有很好的一致性。实验结果和数值模拟结果均表明：太赫兹波信号在相同的实验等离子体中传输衰减比毫米波信号小得多，具有更强的穿透等离子体能力；毫米波与太赫兹波信号在等离子体中传输衰减量随着等离子体电子密度的增加而增加，二者的差值也增加；太赫兹波能够作为解决高密度等离子体中电磁波传输的有效技术手段。

Millimeter wave and terahertz wave transmission characteristics in plasma

An experiment was conducted on the shock tube to explore the transmission characteristics of millimeter wave and terahertz wave in high density plasmas, in order to meet the communication requirement of hypersonic vehicles during blackout. The transmission attenuation curves of millimeter wave and terahertz wave in different electron density and collision frequency were obtained. The experiment was also simulated by auxiliary differential equation finite-difference time-domain (ADE-FDTD) methods. The experimental and numerical results show that the transmission attenuation of terahertz wave in the plasma is smaller than that of millimeter wave under the same conditions. The transmission attenuation of terahertz wave in the plasma is enhanced with the increase of electron density. The terahertz wave is a promising alternative to the electromagnetic wave propagation in high density plasmas.