Multi-mode filter with dielectric resonators based on additive manufactured ceramics
Final Report Abstract
The aim of the research project was to develop filters based on novel dielectric multi-mode resonators that are manufactured using ceramic 3D printing processes. The focus was on the optimization of TE and TM mode filters in order to overcome the limitations of conventional manufacturing methods and increase their performance. A central focus was on the investigation of new types of structures that cannot be produced using conventional manufacturing processes or can only be produced at great expense. One optimization approach here was the design of filters whose resonators and housings are made from the same ceramic material. This minimizes contact losses and significantly improves the temperature stability of the filters, which is particularly important for applications in harsh environments. Another objective of the project was to reduce the volume and weight of the filters. By using multi-mode resonators, which use several modes at the same frequency, more compact filters can be realized. These advances open up new possibilities for the use of filters in areas such as mobile and satellite communications, where space and weight play a crucial role. As part of the project, new geometries were developed that are specially optimized for additive manufacturing. To this end, ceramic materials were first characterized to ensure the best possible electrical and mechanical properties. In addition, different metallization processes were identified and examined with regard to their suitability for coating ceramic materials in order to ensure high conductivity and robustness of the metallic coating. In addition to practical implementation, the project was dedicated to the development of general design guidelines to support future developments in this field. This also included investigations into the temperature stability and electrical performance of the developed filters. The findings were comprehensively documented and made available in the form of scientific publications. The project successfully served as a proof of concept. It impressively demonstrated how the possibilities of ceramic 3D printing can be used to create cost-effective and compact microwave filters that outperform conventional manufacturing methods, particularly in terms of design flexibility and manufacturing speed when making design changes.
Publications
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„Workshop WS11: Additive Manufacturing Technologies for Microwave and Millimeter-Wave Applications - Recent Advances in Ceramic Additive Manufacturing for RF Filter Design and Implementation“, 2022 52nd European Microwave Conference (EuMC), Milan, Italy, 2022
P. Boe, D. Miek & M. Höft
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Bandpass Filter Based on 3D-Printed Ceramic Triple-Mode Resonator with Branches Combining TM and TE Mode Operation. 2023 53rd European Microwave Conference (EuMC), 396-399. IEEE.
Boe, Patrick; Miek, Daniel; Brouczek, Dominik & Höft, Michael
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Dielectric TM-Mode Y-Shaped Doublet Structure. IEEE Journal of Microwaves, 3(1), 84-95.
Miek, Daniel; Boe, Patrick; Kamrath, Fynn; Braasch, Kennet; Taute, Wolfgang & Hoft, Michael
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Additive Manufactured Dual-Mode X-Shaped Filter Realized by High-Permittivity Ceramics. 2024 15th German Microwave Conference (GeMiC), 205-208. IEEE.
Miek, Daniel; Boe, Patrick & Höft, Michael
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Additive Manufacturing of Zirconia Dielectric Resonator Filters Produced by Direct Ink Writing of Particles with Bimodal Size Distribution. 2024 IEEE International Microwave Filter Workshop (IMFW), 99-101. IEEE.
Boe, Patrick; Schadte, Philipp; Adelung, Rainer; Siebert, Leonard & Höft, Michael
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Compact Ku-Band Diplexer With Additive Manufactured Multimaterial Dielectric Resonator Insets. IEEE Microwave and Wireless Technology Letters, 35(6), 800-803.
Boe, Patrick; Brouczek, Dominik; Mikiss, Lisa; Hofbauer, Marc; Miek, Daniel & Höft, Michael
