This article reports the design and fabrication of a novel all-metal antenna operating in the millimeter-wave band. Based on the resonant cavity antenna (RCA) concept, the principle of antenna operation is explained, and parametric studies of several key design parameters are provided. A novel impedance matching technique is introduced to broaden the antenna return loss bandwidth. Two gain enhancement methods have been employed to achieve a more directive beam with reduced side lobes and back lobes. The D-band antenna prototypes are produced using i) all-metal printing without any postprocessing; ii) dielectric printing with copper metallization applied later. Comparisons of the simulated and measured results amongst the antennas fabricated using the two additive manufacturing techniques are made. Measurement results of the two antenna prototypes show that the proposed design can achieve a 14.2% bandwidth with a maximum gain of 15.5 dBi at 135 GHz. The present work is the first D-band resonant cavity antenna fabricated using two different 3D printing methods.

中文翻译：

---

D 波段 3D 打印天线

本文报告了一种在毫米波频段工作的新型全金属天线的设计和制造。基于谐振腔天线 (RCA) 概念，解释了天线的工作原理，并提供了几个关键设计参数的参数研究。引入了一种新颖的阻抗匹配技术来拓宽天线回波损耗带宽。已采用两种增益增强方法来实现具有减少的旁瓣和后瓣的更定向的波束。D 波段天线原型使用 i) 全金属印刷生产，无需任何后处理；ii) 稍后应用铜金属化的介电印刷。对使用两种增材制造技术制造的天线之间的模拟和测量结果进行了比较。两个天线原型的测量结果表明，所提出的设计可以实现 14.2% 的带宽，在 135 GHz 时的最大增益为 15.5 dBi。目前的工作是使用两种不同的 3D 打印方法制造的第一个 D 波段谐振腔天线。