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本文讨论矩形波导宽边中心线上倾斜窄缝隙向自由空间辐射问题,根据缝隙口面切向场的连续条件,计入波导壁的厚度,建立了较严格的积分方程,应用矩量法借助计算机进行数值求解,可获得缝隙口面场分布、散射场以及等效的散射参量和阻抗的普遍表达式。给出了X波段等效散射参量、等效阻抗随频率的变化规律,以及谐振电阻和谐振长度随倾角、波导壁厚度和频率的变化规律。理论计算结果与已有的实验数值吻合良好。
In this paper, we discuss the problem that the narrow slant slit on the broadside of rectangular waveguide radiates to the free space. According to the continuous condition of the tangential field at the slit, the thickness of the waveguide wall is taken into account and a more exact integral equation is established. By using the method of moment For numerical solution, the general expressions for the distribution of the slot surface field, the scattering field and the equivalent scattering parameters and impedances can be obtained. The equivalent scattering parameters of X-band, the variation law of the equivalent impedance with frequency, and the variation law of resonance resistance and resonance length with the inclination, waveguide wall thickness and frequency are given. The theoretical calculation results are in good agreement with the existing experimental data.