A monolithic vertical integration concept for compact coaxial-resonator-based bandpass filters using additive manufacturing

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Zhao, Kunchen
Psychogiou, Dimitra
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Institute of Electrical and Electronics Engineers (IEEE)
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This paper reports on a compact, low-cost and low-loss monolithic integration concept for additively-manufactured coaxial-resonator-based bandpass filters (BPFs). Size compactness and low weight are achieved by vertically-stacking capacitively-loaded coaxial resonators and by monolithic integration that eliminates the need for assembly screws or fixtures. Furthermore, the proposed vertical integration concept allows for: i) flexible cross couplings to be realized enabling highly-selective transfer functions through transmission zero (TZ) generation and ii) for fairly complex geometries to be manufactured using low-cost stereolithography apparatus (SLA). For proof-of-concept demonstration purposes, a two-pole BPF with fractional bandwidth (FBW) of 8.5% and a three-pole/one-TZ BPF with FBW 6.2% at 3.8 GHz were designed, SLA-manufactured and measured. They exhibited low-levels of insertion loss (< 0.1 dB), high effective quality factors > 1,833 and wide spurious-free operation.
Additive manufacturing , Band-pass filters , Bandpass filters , Coaxial cavity filters , Coaxial cavity resonators , Couplings , High-Q filters , Microwave filters , Radio frequency , Resonator filters , Resonators , Three-dimensional displays
Zhao, K. and Psychogiou, D. (2021) 'A monolithic vertical integration concept for compact coaxial-resonator-based bandpass filters using additive manufacturing', IEEE Microwave and Wireless Components Letters. doi: 10.1109/LMWC.2021.3062825
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