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Qian, Lu
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Publications (7/7 displayed)
- 2023Lightweight, High-Q and High Temperature Stability Microwave Cavity Resonators Using Carbon-Fiber Reinforced Silicon-Carbide Ceramic Compositecitations
- 2023Compact Self-Supportive Filters Suitable for Additive Manufacturingcitations
- 2023Compact Monolithic 3D-Printed Wideband Filters Using Pole-Generating Resonant Irisescitations
- 2022A Narrowband 3-D Printed Invar Spherical Dual-Mode Filter With High Thermal Stability for OMUXscitations
- 2022Compact monolithic SLM 3D-printed filters using pole-generating resonant irisescitations
- 2022Thermal stability analysis of 3D printed resonators using novel materialscitations
- 2021Investigation of a 3D-printed narrowband filter with non-resonating nodescitations
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article
Compact Self-Supportive Filters Suitable for Additive Manufacturing
Abstract
An irregular-hexagonal resonator geometry is proposed for additively manufactured microwave filters. This geometry allows closely packed resonators to form very compact filters of various topologies fulfilling transfer functions with transmission zeros. It also minimizes the overhangs and allows vertical printing along the direction of the input/output ports, without any internal support structure and with a much-reduced profile. The characteristics of the resonator and the trade-off between compactness and quality factor has been analyzed. Three bandpass filters have been demonstrated. Two of them are designed with non-resonating node topologies with fractional bandwidths of 5% and 1%, respectively, using the step-tuning technique. All three filters are fabricated using selective laser melting (SLM) technique. The performance of the fabricated filters is compared with the EM simulation. Very good agreement has been achieved for all three filters. The effectiveness of tuning has also been demonstrated. The resonator structure has offered high printability in the manufacturing and high level of modularity and flexibility in the design.