The design and fabrication of a low-cost, wideband fully 3-D-printed coaxial line with air-dielectric is demonstrated. Support of the inner conductor is achieved with shorted stubs, the shape and length of which are determined with electrical performance and manufacturing requirements in mind. Direct metal laser sintering (DMLS) fabrication is leveraged for manufacturing, enabling fully monolithic fabrication and follow-up integration with 2.4-mm connectors. Measurements show a return loss of >20 dB and an insertion loss of <0.35 dB for 12-mm-long line from 20 to 39 GHz. Agreement with full-wave simulations indicates that there is a great practical potential for DMLS components and systems based on coaxial lines at these frequencies.

中文翻译：

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全金属 3D 打印空气电介质同轴线的设计和表征


演示了采用空气电介质的低成本、宽带全 3D 打印同轴线的设计和制造。内导体的支撑是通过短截线实现的，短截线的形状和长度取决于电气性能和制造要求。利用直接金属激光烧结 (DMLS) 制造进行制造，实现完全单片制造以及与 2.4 毫米连接器的后续集成。测量结果显示，12 毫米长线路在 20 至 39 GHz 范围内的回波损耗为 >20 dB，插入损耗为 <0.35 dB。与全波仿真的一致性表明，基于这些频率的同轴线的 DMLS 组件和系统具有巨大的实际潜力。