2021
DOI: 10.1017/s1759078721001471
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Monolithically-integrated 3D printed coaxial bandpass filters and RF diplexers: single-band and dual-band

Abstract: 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 cou… Show more

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Cited by 8 publications
(10 citation statements)
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“…The diameter of the holes is selected so that they don't radiate at the center frequency and as such have no impact in the passband II. As shown, the proposed dual-band filter has lower IL and higher than the majority of the reported 3D printed dual-band BPFs and especially the ones in [13]- [14]. Furthermore, the dual-mode nested-spherical resonator concept is uniquely shown in this work for the first time for the realization of compact dual-band BPFs.…”
Section: Test Results and Discussionmentioning
confidence: 70%
See 2 more Smart Citations
“…The diameter of the holes is selected so that they don't radiate at the center frequency and as such have no impact in the passband II. As shown, the proposed dual-band filter has lower IL and higher than the majority of the reported 3D printed dual-band BPFs and especially the ones in [13]- [14]. Furthermore, the dual-mode nested-spherical resonator concept is uniquely shown in this work for the first time for the realization of compact dual-band BPFs.…”
Section: Test Results and Discussionmentioning
confidence: 70%
“…Additive manufacturing (AM) techniques (or 3D printing) have been increasingly explored for manufacturing 3D resonators-based microwave dual-band BPFs, such as the spherical resonator-based configuration in [7], the ellipsoidal resonator-based in geometry in [8], and the coaxial resonatorbased dual-band BPFs in [13]- [14]. Compared to traditional CNC machining techniques, AM facilitates filters with higher geometrical complexity and is potentially suitable for monolithic 3D integration.…”
Section: Introductionmentioning
confidence: 99%
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“…Bandpass filters (BPFs) with electronically reconfigurable transfer functions are highly-desirable in these systems to enhance existing capabilities, and miniaturize their size [2]. The majority of the tunable BPFs that have been presented to date are large in size and are based on low-quality factor (Q) (around 50-150 for lumped-element (LE) and microstrip-type configurations [3]- [4], and 300-800 for coaxialresonator-based components [5]) resonators. These also exhibit high levels of in-band insertion loss (IL) between 3-10 dB [4], [6].…”
Section: Introductionmentioning
confidence: 99%
“…Recently, monolithic SLA-based integration concepts were reported for the manufacturing coaxial cavity-based filtering components [45], [46], [47], [48], [49]. They demonstrated competitive RF performance characteristics and significantly reduced volume and weight when compared to their splitblock counterparts.…”
mentioning
confidence: 99%