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中文摘要：
对粒子模拟中的高频噪声的产生机理进行分析,并给出一种既能对高频数值噪声进行过滤又能满足Q值较高的相对论型微波器件计算要求的时域有限差分（FDTD）算法———High_Q FDTD算法.在中心差分FDTD算法和时偏FDTD算法的基础上,给出High_Q算法的计算公式,并着重分析算法的稳定性与收敛性.通过对相对论返波管（RBWO）的计算,将计算结果与中心差分和时偏FDTD算法的计算结果比较,验证算法有较好的滤波特性和计算精度.
英文摘要：
Mechanism of high-frequency noise in particle-in-cell（PIC） simulation is analysed.An effective finite-difference time-domain（FDTD） method called High_Q FDTD method is developed in which high-frequency noise is filtrated and high quality factor device is calculated with PIC simulation.Formulation of the method is derived on the basis of time-biased and centered-difference FDTD method.Stability and convergence of this method are well analysed.Filter efficiency and calculation precion of this method are compared with those of the time-biased and centered-difference FDTD method in computation of a relativistic backward wave oscillator（RBWO）.
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