In this article, we propose a wideband fully metallic impedance-matching horn lens antenna based on glide symmetry realized in the gap waveguide technology. A multiple iterative method is adopted, which overcomes the limitation of large phase deviations at the interface of traditional lens antennas, thus increases the directivity as a result. Moreover, the glide-symmetric configurations of inner metallic pins within the gap waveguide are employed to construct the artificial dielectric lens, with the advantage of the ultralow dispersion, which is especially helpful to broaden the working bandwidth and improve the lens performance. The antenna is fed by a stepped double-ridged gap waveguide which can easily excite the antenna working in a wideband. To reduce the undesired reflections at the antenna aperture, the antenna is ended with a tapered structure as an impedance transition. A prototype of the horn lens antenna is manufactured and measured, showing a broad operation bandwidth from 12 to 18.5 GHz with S11 less than −10 dB. The antenna can be further extended to the millimeter band due to the low losses of the gap waveguide at high frequencies and the iterative method can also be applied to other types of lens antenna designs.

中文翻译：

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间隙波导技术中的滑动对称透镜天线

在本文中，我们提出了一种基于间隙波导技术中实现的滑动对称性的宽带全金属阻抗匹配喇叭透镜天线。采用多次迭代的方法，克服了传统透镜天线界面相位偏差大的限制，从而提高了方向性。此外，采用间隙波导内金属针的滑动对称配置构建人工介电透镜，具有超低色散的优点，特别有助于拓宽工作带宽和提高透镜性能。天线由阶梯式双脊间隙波导馈电，可以轻松激发工作在宽带上的天线。为了减少天线孔径处的不希望有的反射，天线以锥形结构作为阻抗过渡结束。制造和测量了喇叭透镜天线的原型，显示了从 12 到 18.5 GHz 的宽工作带宽，S11 小于 -10 dB。由于间隙波导在高频下的低损耗，天线可以进一步扩展到毫米波段，迭代方法也可以应用于其他类型的透镜天线设计。