A Multibeam Tapered Cylindrical Luneburg Lens
A Multibeam Tapered Cylindrical Luneburg Lens
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DOI：
10.1109/tap.2020.3048508
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发表时间：
2021-01
影响因子：
5.7
通讯作者：
M. Mirmozafari;M. Tursunniyaz;H. Luyen;J. Booske;N. Behdad
中科院分区：
文献类型：
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作者：
M. Mirmozafari;M. Tursunniyaz;H. Luyen;J. Booske;N. Behdad
我们提出了一种圆柱形、多波束、改进的吕尼堡透镜天线。该天线具有外形小、阻抗匹配好、增益高、广角扫描能力强等特点。我们将介电盘的厚度沿其半径逐渐变细，以非色散的方式获得所需的透镜折射率分布。17个介质填充波导馈送，围绕透镜的焦弧圆周排列，提供从宽方向±60°范围内几乎不变的方位扫描。透镜和波导馈电的内部由相同的介电材料制成，提供了从馈电天线到透镜的平滑阻抗转换。制作了天线样机并对其进行了表征。在14 ~ 16 GHz范围内，实测反射系数优于−10 dB。在整个工作频率范围内，馈源之间的隔离度保持在24 dB以上。在最大60°扫描角附近，我们测量到的最大天线增益为20.5 dB，增益损失仅为1.5 dB。所提出的高增益、多波束天线设计可广泛应用于汽车和监视雷达等领域。
We present a cylindrical, multibeam, modified Luneburg lens antenna. The proposed antenna features low-profile, good impedance match, high gain, and wide angle scanning capability. We tapered the thickness of a dielectric disk along its radius to achieve the required refractive index profile of the lens in a nondispersive fashion. Seventeen dielectric-filled waveguide feeds, arranged circumferentially around the focal arc of the lens, provide almost invariant azimuthal scanning in the range of ±60° from broadside direction. The lens and the interior of the waveguide feeds are made of the same dielectric material, offering a smooth impedance transition from the feed antenna to the lens. A prototype of the antenna was fabricated and characterized. Measured reflection coefficient is better than −10 dB from 14 to 16 GHz. The isolations between feeds remain higher than 24 dB over the entire operational frequency range. We measured a maximum antenna gain of 20.5 dB with only 1.5 dB gain loss near the maximum 60° scanning angle. The proposed high-gain, multibeam antenna design can be used in a wide range of applications including automotive and surveillance radars.