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本文运用场匹配法对具有任意位错的双排矩形栅慢波结构的场分布、色散特性及耦合阻抗进行了研究.研究结果表明,场匹配法推导的色散特性与仿真软件CST和HFSS计算的结果完全一致,耦合阻抗介于CST和HFSS之间.在此基础上,详细研究了上下两排系统之间位错对色散特性及耦合阻抗的影响.当位错严格为半个周期时,第一阻带消失,第一个模式最高截止频率与第二个模式最低截止频率重叠,发生简并;当位错为0.45倍周期时,在保证耦合阻抗不变的情况下,基模的通带虽降低了2.8GHz,但阻带却增大了7.9GHz,从而可以有效避免简并及模式竞争的发生.
In this paper, the field distribution, dispersion characteristics and coupling impedance of double-row rectangular grid slow-wave structures with arbitrary dislocations are studied by using field matching method.The results show that the dispersion characteristics deduced by the field matching method and the simulation software CST and HFSS The results are completely consistent with the coupling impedance between CST and HFSS.Based on this, the influence of the dislocations on the dispersion characteristics and the coupling impedance between the two upper and lower systems is studied in detail.When the dislocation is strictly half a cycle, A stop band disappears, the first mode of the highest cut-off frequency and the second mode of the lowest cut-off frequency overlap, degeneracy occurs; when the dislocation is 0.45 times the period, the coupling impedance to ensure the same circumstances, the base mode passband Although reduced by 2.8GHz, but the stop band has increased 7.9GHz, which can effectively prevent the degeneration and mode competition.