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

Electronics

Lida Shen¹  Yun Ye¹  Jianfeng Zhao¹  Mingbo Qiu¹  Qingrong Liu¹  Chen Jiao¹  Deqiao Xie¹  Changjiang Wang²  Meng Xiao³ 

[1] College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;Department of Engineering and Design, University of Sussex, Sussex House, Brighton BN1 9RH, UK;Nanjing Institution of Advanced Laser Technology, Nanjing 210038, China;

关键词: microwave dielectric ceramics;    filter;    additive manufacturing;    digital light processing;    post annealing;    dielectric properties;   

DOI  :  10.3390/electronics8101067

来源: DOAJ

【 摘 要 】

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: ε_r = 12.4, Q × f = 111,000 GHz, τ_f = +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.

【 授权许可】

Unknown