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在某种机上导航设备中,要求设计一种由四端口轮流馈电而产生四个对称的、独立波束的、类似“梯子形”结构的波导阵列天线。由此要求阵面裂缝结构为轴对称的,这样使天线阵面功率分布不可能是对称的,而且后半阵面的功率分布呈急剧下降趋势,以致口径利用系数很低。本文提供一种设计方法,与已见文献设计方法相比较,在波束方向图指标相类似的情况下,口径利用系数提高10％以上。
In some types of on-board navigation devices, it is demanded to design a waveguide array antenna with four symmetrical, independent beams and a “ladder-like” structure fed by four ports in turn. As a result, the crack structure in the frontal plane is required to be axisymmetric, so that the power distribution of the antenna frontal plane can not be symmetrical, and the power distribution of the rear half frontal plane shows a sharp downward trend, so that the aperture utilization factor is very low. This article provides a design methodology that compares with the existing literature design approach and increases the caliber utilization factor by more than 10% with similar beam pattern indicators.