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考虑到非理想导体波导壁金属损耗对传播常数的影响,对理想金属边界条件进行一阶近似微扰,得到了非理想波导的传播常数。和传统微扰法相比,能够在截止频率附近较为精确地计算衰减常数,也适用于导体损耗较大的情况;同时能给出非理想导体波导壁对相位常数的影响。将结果与Ansoft HFSS软件的仿真结果进行比较,两者具有较好的一致性。同时给出了边界条件微扰法解与解析解及传统微扰法解在一定条件下的联系,表明边界微扰法比解析法实现简单,比传统微扰法具有更广泛的适用性。
Considering the influence of metal loss on the propagation constant of the waveguide wall, the first-order perturbation of the ideal metal boundary conditions is given and the propagation constant of the non-ideal waveguide is obtained. Compared with the traditional perturbation method, the decay constant can be calculated more accurately near the cut-off frequency and the larger the conductor loss. Meanwhile, the influence of the non-ideal conductor waveguide wall on the phase constant can be given. The results are compared with the simulation results of Ansoft HFSS software, the two have good consistency. At the same time, the relations between the perturbation method of the boundary condition and the analytic solution and the traditional perturbation method under certain conditions are given. It is shown that the method of the boundary perturbation method is simpler and has more applicability than the traditional perturbation method.