X波段六腔渡越管振荡器的高频特性研究

 从麦克斯韦方程出发,采用时域有限差分法（FDTD）和离散傅里叶变换（DFFT）相结合的方法,通过数值计算得出了六腔开放式谐振腔中前四个谐振频率和场分布,计算出的谐振频率与实验测量结果基本相同。比较了开放腔和封闭腔谐振频率,验证了TEM波吸收边界条件,并在实际编程计算中得以应用。计算结果为六腔渡越管振荡器的机理研究提供了依据。

Numerical analysis on the high frequency characteristics of six-cavity resonator with open boundary

This paper presents a novel, highly accurate numerical synthetic technique for determining the high frequency characteristics of six-avity resonator with open boundary. The numerical method based on the coupling of the finite difference method in time domain (FDTD) with the discrete fast Fourier transform (DFFT)is applied to calculate the first four eigenfrequencies and eigenfunctions of the resonator.The absorbing boundary condition for TEM wave is tested numerically,and it is applied to programming. The cold testing of the cavity is done and the results are in good agreement with the numerical ones. The first four eigenfrequencies and eigenfunctions of the close cavity is calculated as well.