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将任意形状槽的连续轮廓近似用一系列相连的矩形阶梯近似,利用各阶梯面上导纳的匹配,以及槽与互作用区边界场的连续与匹配条件,获得了具有任意槽的矩形波导栅慢波结构的色散方程和耦合阻抗的表达式,并进行理论上的验证.加工制作了矩形槽波导栅模型,冷测表明理论值与测量值相吻合.分别求解几种特殊槽形矩形波导栅慢波结构的色散特性及耦合阻抗,其中,三角形结构的色散和耦合阻抗均最弱,而倒梯形结构色散最强,耦合阻抗最大.
By approximating the continuous contour of any shape slot to a series of connected rectangular ladder approximations, the rectangular waveguide grating with arbitrary slot is obtained by using the admittance matching of each ladder plane and the continuous and matching condition of the boundary field between slot and interaction region. The dispersion equation of the slow-wave structure and the expression of the coupled impedance are theoretically validated.A rectangular groove waveguide grating model is fabricated and measured by cold measurement, which shows that the theoretical value and the measured value agree well.They are solved respectively by several special rectangular groove waveguide grids Dispersion structure and coupling impedance of the slow-wave structure. Among them, the dispersion and the coupling impedance of the triangular structure are the weakest, while the inverse trapezoidal structure has the strongest dispersion and the maximum coupling impedance.