In this letter, a three-dimensionally printed one-sixteenth fractional spherical homogeneous dielectric lens antenna on a metallic corner reflector is designed. This lens antenna is fed by an open-ended rectangular waveguide for high-gain radiation. The main design concept is to produce an equivalent spherical dielectric lens that is excited by multiple virtual sources arising from the multiple images of the original feed by the corner reflector's walls. Thus, the antenna can retain a compact size with a sufficiently effective aperture to produce a higher radiation gain. In particular, a ray-tracing method of geometrical optics is introduced for easily determining the proper sizes of the corner reflector's walls, which leads the proposed work to be more efficient than using a full-wave simulation. The superiority of the antenna is validated by examining a practical design for a radar system at 9 GHz band. It is found that the optimum dielectric constant (ϵr), ground plane size, and effective aperture area, relatively speaking, depend on the radius of the lens's sphere. This proposed antenna well suits multifeed satellite communication antennas, radar, and other high-gain antennas applications.

中文翻译：

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用于高增益辐射且尺寸减小的金属角反射器上的十六分之一球面同质介质透镜天线

在这封信中，设计了一种在金属角反射器上的三维印刷十六分之一分数球面均匀介质透镜天线。该透镜天线由用于高增益辐射的开口矩形波导馈送。主要设计概念是产生等效球面介质透镜，该透镜由角反射器壁的原始馈源的多个图像产生的多个虚拟源激发。因此，天线可以保持紧凑的尺寸和足够有效的孔径以产生更高的辐射增益。特别是，引入了几何光学的光线追踪方法，可以轻松确定角反射器壁的适当尺寸，这使得所提出的工作比使用全波模拟更有效。通过检查 9 GHz 频段雷达系统的实际设计，验证了天线的优越性。结果表明，相对而言，最佳介电常数 (ϵr)、接地平面尺寸和有效孔径面积取决于透镜球面的半径。这种提议的天线非常适合多馈电卫星通信天线、雷达和其他高增益天线应用。