The manuscript reports on additively-manufactured (AM) coaxial-resonator-based bandpass filters (BPFs) and RF diplexers. A monolithic integration concept using stereolithography apparatus (SLA) is proposed and discussed in detail. Coupled-resonator-based synthesis alongside full-electromagnetic-based design methods is used for the design of the monolithic filters and RF diplexers. In particular, the paper discusses a new external coupling mechanism for dual-band BPFs that allow to independently control the coupling in each of the BPF passbands. Furthermore, a novel coaxial transmission line-type T-junction is proposed for the design of single- and dual-band RF diplexers. For practical validation purposes, multiple BPF and RF diplexer prototypes were designed, manufactured and tested at S- and C-band demonstrating the applicability of the proposed concept to low-cost, low-loss and low-weight RF components with complex geometrical features.

该手稿报告了基于增材制造 (AM) 同轴谐振器的带通滤波器 (BPF) 和射频双工器。提出并详细讨论了使用立体光刻设备 (SLA) 的单片集成概念。基于耦合谐振器的合成以及基于全电磁的设计方法用于设计单片滤波器和射频双工器。特别是，本文讨论了一种新的双频 BPF 外部耦合机制，该机制允许独立控制每个 BPF 通带中的耦合。此外，提出了一种新型同轴传输线型 T 型结，用于设计单频和双频射频双工器。出于实际验证目的，设计了多个 BPF 和 RF 双工器原型，