Axially Steered Spots of Near-Field Fresnel Zone Plate Lens With Sweeping Frequency
Axially Steered Spots of Near-Field Fresnel Zone Plate Lens With Sweeping Frequency
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扫频近场菲涅尔波带板透镜的轴向光斑
DOI：
10.1109/lawp.2014.2322094
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发表时间：
2014-01-01
影响因子：
4.2
通讯作者：
Tian, Hua
中科院分区：
文献类型：
--
作者：
Li, Zhiping;Wang, Zhengpeng;Tian, Hua
近场菲涅耳波带片（NFFZP）的频率特性是电磁场研究的重要内容。NFFZP透镜被设计成将球面波聚焦在光斑处。NFFZP透镜的光斑根据工作频率在轴上被电子地向前和向后操纵。推导了光斑随扫频运动的非线性公式。给出并分析了主斑和分斑的焦移。此外，功率漂移，焦深，旁瓣电平，和透镜分辨率的特点。所有结果都通过Ku波段的全波模拟得到了验证。
The frequency performance of near-field fresnel zone plate (NFFZP) is of fundamental interest in electromagnetic field. An NFFZP lens is designed to focus a spherical wave at a spot. The spots of NFFZP lens are electronically steered forward and backward on the axis according to the operating frequency. Several nonlinear formulas are derived to describe the spots movement with sweeping frequency. The focal shifts of the primary and fractional spots are presented and analyzed. Furthermore, the power drift, the depth of focus, the sidelobe level, and the lens resolution are characterized. All the results are verified by performing full-wave simulations in Ku-band.