宽带相控阵天线波束控制算法分析与优化

宽带相控阵天线在瞬时宽带工作模式下,天线方向图的波束指向将不可避免地出现色散现象,可在天线单元或子阵级采用延时器以改善色散问题。针对延时器、移相器控制码的计算方法,文中在延时剩余法的基础上,提出了中频随动法和自适应最小步长两种新算法。两种算法不仅具有更好的适应性,而且能够改善天线宽带方向图性能。

Analysis and Optimization of the Beam Control Algorithm for Wide-band Phased Array Antenna

The beam pointing squint phenomenon can be improved or avoided by connecting a true time delay line to each antenna element or sub-array when the phased array antenna operates at wideband mode and transmit/ receive signal with an instantaneous wideband bandwidth. Based on the method of delay remainder, two novel methods have been proposed in this paper to calculate and optimize the codes of true time delay lines and phase-shifters. One is method of trace center frequency which is capable of achieving less beam pointing deviation and lower side-lobe levels when the instantaneous frequency band varies and the other is adaptive minimum step method which can further reduce the beam pointing deviation across the operating frequency band . The proposed methods can be widely utilized in wideband phased array for improving the performance of radiating patterns across a wide-band frequency range. The closed forms corresponding to each method have been derived and several examples have been illustrated to verify the effectiveness of the proposed methods.