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研究光纤光栅色散效应对基于光栅的相控阵天线的影响,该相控阵天线基于典型的离散光纤光栅阵列的实时延迟线结构。分析表明,单边带调制方式可以有效地克服色散效应对所恢复的微波信号幅度的影响。但光纤光栅色散效应对所恢复的微波信号相位的作用仍影响实时延迟线的性能,从而改变天线阵列最大辐射方向。通过选择合适的天线元之间的距离以及提高相邻通道所对应的光纤长度差可以降低光纤光栅色散效应的影响。
The effect of fiber grating dispersion on the grating-based phased-array antenna based on the real-time delay line structure of a typical discrete fiber grating array was investigated. The analysis shows that the single-sideband modulation method can effectively overcome the influence of the dispersion effect on the amplitude of the recovered microwave signal. However, the effect of fiber grating dispersion on the phase of the recovered microwave signal still affects the performance of the real-time delay line, thereby changing the maximum radiation direction of the antenna array. The effect of fiber grating dispersion can be reduced by selecting the appropriate distance between antenna elements and increasing the difference between the lengths of the adjacent fibers.