用于广角扫描的平底宽带多光束Luneburg透镜
Flat-Base Broadband Multibeam Luneburg Lens for Wide Angle Scan
摘要：
在本文中，我们提出了一种设计的平底Luneburg型透镜天线，设计用于广角扫描。该天线由一个11层的透镜组成，在其底部由一个6x6的波导阵列馈电。该透镜是宽带的，并且具有高的孔径效率，仅比具有均匀幅度和相位分布的参考孔径天线低1dB。其副瓣电平在波束角处为-21dB，在扫描角为64 °时为-13dB。它显示出良好的性能相比，平面Luneburg透镜以前在文献中报道，在增益，扫描能力，以及易于制造。它被证明有能力产生多个光束同时，多角度，扫描能力。已经使用两种不同的方法来设计用于透镜的波导的6x6馈送阵列。其中第一种使用传统的完美电导体（PEC）波导，而第二种使用在金属变得有损耗和等离子体激元的频率下具有高介电常数的导波区域材料。本文研究了这两种馈源阵列设计的透镜性能。
英文摘要：
In this paper we present the design of a flat-base Luneburg type of lens antenna, designed for wide angle scan. The antenna consists of a 11-layer lens, fed at its base by a 6x6 array of waveguides. The lens is broadband and has a high aperture efficiency, only 1 dB below that of a reference aperture antenna with uniform amplitude and phase distributions. Its sidelobe level is -21 dB at boresight and -13 dB when the scan angle is 64 degrees. It shows good performance when compared to the flat Luneburg lens previously reported in the literature, in terms of gain, scan capability, as well as ease of fabrication. It is shown to have the capability of producing multiple beams simultaneously, multiple angle, scan capability. Two different methodologies have been used to design the 6x6 feed array of waveguides for the lens. The first of these utilizes a conventional perfect electric conductor (PEC) waveguide, while the second employs materials for the guided wave region that have a high permittivity at frequencies at which metals become lossy and plasmonic. The performance of the lens has been investigated in this paper for both of these feed array designs.
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