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本文叙述了圆波导窗近似计算的方法。在圆波导间隙D_1《λg、D_2《λg的条件下,可忽略窗另一边的阻抗影响便能计算引入阻抗。当圆波导窗的阻抗等于矩形波导阻抗时,反射最小。在频带中心频率上,使引入阻抗与矩形波导阻抗相等,便可求得圆波导间隙D_1和D_2。采用计算出的尺寸,当窗两边抗流槽尺寸调整达到最佳、驻波系数ρ<1.2时,窗带宽能做到15—20％。最后,还对该窗带宽进行了理论推算,表明不超过25％。
This paper describes the approximate calculation method of circular waveguide window. Under the conditions of circular waveguide gap D_1 “λg, D_2” λg, the introduction impedance can be calculated by neglecting the influence of impedance on the other side of the window. When the circular waveguide window impedance equal to the rectangular waveguide impedance, the minimum reflection. At the center frequency of the band, the impedances of the rectangular waveguides and the impedances of the rectangular waveguides are equalized to obtain the circular waveguide gaps D_1 and D_2. Using the calculated dimensions, the window width can be 15-20% when the size of the run-off slots on both sides of the window reaches the best size and the VSWR ρ <1.2. Finally, the window bandwidth is also theoretically calculated, indicating that no more than 25%.