为了实现波束可控，可用开关控制无源单极子的接地状态来改变其阻抗和电流分布。
In order to get beam steering, the switches control the states of the parasitic monopoles to change their impedance and current distribution.
本文首先分析了焦平面阵列馈源横向偏焦产生多波束的原理，并采用面电流法对偏焦抛物面天线方向图进行了编程计算。
Based on the principles that lateral offset-focus feed makes the antenna pattern deflect an angle, the multi-beam antenna can be used in passive imaging system.
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