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应用多光子非线性Compton散射模型和数值计算方法,研究了激光等离子体通道天线传播和辐射特性,结果表明:随通道周围介质损耗和传输模式阶数的增大,传输模式THnm衰减常数明显增大.这是因散射使通道内外电场和磁场增强,粒子间碰撞频率增大,电场使更多分子电离而吸收更多能量的缘故.随模式阶数增大,电性有耗介质使相移常数明显减小.这是因散射使高阶模式可能存在被耦合电场俘获的缘故.等离子体耦合频率为0.7附近,衰减常数随频率增大而剧烈增大.这是因散射使介质分子发生二、三阶电离,更多电子被耦合电场急剧加速的缘故.随天线长度增加,天线辐射方向图主瓣和副瓣数量、宽度和最大辐射方向发生明显变化.这是因散射使天线频率增大,辐射波长变短,粒子电离几率增大,辐射波能量和频率成分增大的缘故.
The multi-photon non-linear Compton scattering model and numerical calculation method were used to study the propagation and radiation characteristics of the laser plasma channel antenna. The results show that the attenuation constant of the transmission mode THnm increases with the increase of the dielectric loss and the transmission mode order around the channel, This is due to scattering to enhance the electric field and magnetic field inside and outside the channel, increasing the collision frequency between particles, the ionization of more molecules by the electric field to absorb more energy reason .As the order of mode increases, This is due to the scattering of high-order modes may be trapped by the coupling electric field.The plasma coupling frequency of 0.7 near the decay constant with the increase of the frequency increases violently.This is due to scattering medium molecules occur two, Third-order ionization, more electrons are rapidly accelerated by the coupled electric field reason.As the antenna length increases, the main lobe and sidelobe number of the antenna radiation pattern, the width and the maximum radiation direction changes significantly.This is due to the scattering antenna frequency increases, Radiation wavelength becomes shorter, the probability of particle ionization increases, the radiation energy and frequency components increase.