采用积分方法分析了线电荷串,沿周期性理想金属光栅表面平行移动时产生的史密斯帕塞尔辐射。分别对短周期光栅、低能量线电荷串与长周期光栅、高能量线电荷串的辐射情况进行了数值计算。相对单个线电荷而言,N个线电荷与反射光栅作用产生的辐射场密度,在频率是线电荷串调制频率的整数倍处出现最大,辐射谱宽变窄;随电荷能量增高,辐射能量向高频方向移动,并具有强烈的定向性;可以通过调节线电荷调制频率等参量实现辐射电磁波频率锁定。研究结果表明,对高能量与低能量的电荷参量,适当选择光栅尺寸与线电荷串间隔周期,都可使辐射波工作于太赫兹波段。 The integral method is used to analyze the Smithsonian radiation produced by the string of electric charges and moving parallel to the surface of the periodic ideal metal grating. The radiation of short-period grating, low-energy charge and long-period grating and high-energy charge series were numerically calculated. Compared with single linear charge, the density of radiation field produced by the action of N linear charges and the reflection grating appears the largest at integer multiple of the modulation frequency of linear charge string, and the radiation spectrum width becomes narrower. With the increase of charge energy, High-frequency direction of movement, and has a strong directivity; can adjust the line charge modulation frequency and other parameters to achieve electromagnetic radiation frequency lock. The results show that for the high-energy and low-energy charge parameters, the proper selection of the grating size and the interval of the line charges can make the radiation work in the terahertz band.