Additive manufacturing of monolithic microwave dielectric ceramic filters via digital light processing

Liu, Qingrong, Qiu, Mingbo, Shen, Lida, Jiao, Chen, Ye, Yun, Xie, Deqiao, Wang, Changjiang, Xiao, Meng and Zhao, Jianfeng (2019) Additive manufacturing of monolithic microwave dielectric ceramic filters via digital light processing. Electronics, 8 (10). a1067. ISSN 2079-9292

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Abstract

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.

Item Type: Article
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Research Centres and Groups: Dynamics, Control and Vehicle Research Group
Depositing User: Chang Wang
Date Deposited: 30 Sep 2019 13:33
Last Modified: 30 Sep 2019 13:45
URI: http://sro.sussex.ac.uk/id/eprint/86418

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