菲涅尔区相位修正反射面天线的频率特性

On the Frequency Characteristics of Fresnel Zone Plate Reflector

从菲涅尔区相位修正结构对斜入射平面波形成的聚焦场表达式出发 ,分别从正入射情形下焦点处场的频率变化 ,任意入射时焦散区内聚焦场的频率变化以及小频率变化时相位修正量和相位修正区域对聚焦场频率变化特性的贡献等几个方面 ,详细地分析了这一聚焦结构的频率变化特性。通过数值计算 ,给出一组定量的分析结果 ,对这一聚焦结构的设计及应用有积极的指导作用。

Based on the expression of the fields focused by Fresnel Zone phase correction Plate (FZP) under plane wave illumination,the focusing field changes resulting from the incident wave frequency variation are discussed.The fields variation at focal under normal incidence,and the fields variation in caustics under arbitrary incidence,are analyzed and numerically simulated in details.Special attentions are paid to the different field changes due to the changes of correcting phase amount and the Fresnel zone under frequency perturbation.Several conclusions are drawn that are expected to make better understanding of the focusing characteristics of FZP in frequency domain.