Fresnel Lens at Millimeter-Wave: Enhancement of Efficiency and Radiation Frequency Bandwidth
Fresnel Lens at Millimeter-Wave: Enhancement of Efficiency and Radiation Frequency Bandwidth
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DOI：
10.1109/tap.2017.2755120
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发表时间：
2017-11-01
影响因子：
5.7
通讯作者：
Lafond, Olivier
中科院分区：
文献类型：
--
作者：
Jouade, Antoine;Himdi, Mohamed;Lafond, Olivier
本文对菲涅耳透镜天线的性能进行了详细的研究。从口径效率和宽频带范围内稳定的辐射方向图两个方面对其性能进行了评价。本文提出了一种通过平滑补偿到达透镜表面的球面位相前来提高光圈效率的有效技术。馈线已经过优化，以适应轴对称的类CoSN辐射图案。为此，已经使用了精确的工艺过程来制造能够平滑补偿相移的透镜。将该透镜与具有相同物理尺寸和馈送系统的经典菲涅尔透镜进行了比较。测量结果表明，最大测量增益为38.9 dBI，对应的最大测量孔径效率为59%，辐射频带宽度为29.25 GHz，带宽为90 GHz。与经典菲涅耳透镜相比，口径效率提高了60%，辐射频率带宽提高了72%。
In this paper, the performance of Fresnel lens antennas is investigated in detail. The performance is evaluated in terms of aperture efficiency and stable radiation pattern over a wide frequency band. This paper proposes an efficient technique for enhancing aperture efficiency by smoothly compensating for the spherical phase front arriving upon the lens surface. The feeder has been optimized to fit an axially symmetric cosn-like radiation pattern. For this, an accurate technological process has been used to manufacture a lens that allows for smooth compensation of the phase shift. The lens is compared with a classic Fresnel lens having the same physical dimensions and feeding system. The improvement is validated by measurement, which has revealed a maximum measured gain of 38.9 dBi corresponding to a maximum measured aperture efficiency of 59% with a -2 dB radiation frequency bandwidth of 29.25 GHz around 90 GHz. This amounts to an aperture efficiency enhancement of 60% and -2 dB radiation frequency bandwidth enhancement of 72% as compared with those of the classic Fresnel lens.