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Open AccessArticle

Additive Manufacturing of Monolithic Microwave Dielectric Ceramic Filters via Digital Light Processing

1
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2
Department of Engineering and Design, University of Sussex, Sussex House, Brighton BN1 9RH, UK
3
Nanjing Institution of Advanced Laser Technology, Nanjing 210038, China
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(10), 1067; https://doi.org/10.3390/electronics8101067
Received: 26 August 2019 / Revised: 16 September 2019 / Accepted: 18 September 2019 / Published: 20 September 2019
(This article belongs to the Special Issue Filter Design Solutions for RF systems)
Microwave dielectric ceramics are employed in filters as electromagnetic wave propagation media. Based on additive manufacturing (AM) techniques, microwave dielectric ceramic filters with complex and precise structures can be fabricated to satisfy filtering requirements. Digital light processing (DLP) is a promising AM technique that is capable of producing filters with high accuracy and efficiency. In this paper, monolithic filters made from Al2O3 and TiO2, with a molar ratio of 9:1 (0.9 Al2O3-0.1 TiO2), were fabricated by DLP. The difference in the dielectric properties between the as-sintered and post-annealed samples at different temperatures was studied. The experimental results showed that when sintered at 1550 °C for 2 h and post annealed at 1000 °C for 5 h, 0.9 Al2O3-0.1 TiO2 exhibited excellent dielectric properties: εr = 12.4, Q × f = 111,000 GHz, τf = +1.2 ppm/°C. After comparing the measured results with the simulated ones in the passband from 6.5 to 9 GHz, it was concluded that the insertion loss (IL) and return loss (RL) of the filter meet the design requirements. View Full-Text
Keywords: microwave dielectric ceramics; filter; additive manufacturing; digital light processing; post annealing; dielectric properties microwave dielectric ceramics; filter; additive manufacturing; digital light processing; post annealing; dielectric properties
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Liu, Q.; Qiu, M.; Shen, L.; Jiao, C.; Ye, Y.; Xie, D.; Wang, C.; Xiao, M.; Zhao, J. Additive Manufacturing of Monolithic Microwave Dielectric Ceramic Filters via Digital Light Processing. Electronics 2019, 8, 1067.

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