Numerical analyze to the high frequency characteristics of six-cavity resonant with open boundary

A novel, Highly accurate numerical synthetic technique for determining the high frequency characteristics of six-avity with open boundary is presented. The numerical method based on the coupling of the finite difference method in time domain with the discrete fast Fourier transform is applied to calculate the first four eigenfrequencies and eigenfunctions of the six-ity with open boundary. The absorbing boundary condition for TEM wave is tested numerically,and it is applied to writing the code. The cold testing of the cavity is done and the results are good agreement with the numerical calculus results. The first four eigenfrequencies and eigenfunctions of the close cavity is calculated as well. The results of the calculation is the foundation of the theoretical analysis of the transit tim