Brief Introduction of Microwave Ceramics Developed in our Labs for Dielectric Resonators

Abstract:

Microwave filters require dielectric ceramic resonators attached to ceramic supports via joining. Among the BaTiO₃, CaTiO₃, and Ba₂Ti₉O₂₀ based-dielectric ceramics prepared in our labs., the CaTiO₃ ceramics modified with NdAlO₃ and Al₂O₃ gave satisfactory dielectric properties: dielectric constant DK = 40.69, quality factor Qxf = 18842 GHz (fo = 6.551 GHz), and frequency temperature coefficient t_f = 2.542 ppm °C^-1. For replacing the hard-to-sinter Al₂O₃ based-ceramic supports, a glass-ceramic of the SiO₂-B₂O₃-P₂O₅-ZnO system was developed, leading to a low sintering temperature of 900 °C, and a low dielectric constant (<4). Finally, a Bi₂O₃-ZnO-SiO₂-Al₂O₃-CaO glass was used as a sealing agent to replace the traditional gluing consisting of an adhesive. The present work hinters that with proper sintering aids, one can produce multilayered and integrated resonators with and without embedded passive elements.

• Periodical: Advanced Materials Research (Volumes 887-888)
• Pages: 294-298
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.887-888.294
• Online since: February 2014
• Authors: Xi Geng Miao*, Jing Jing Liu, Fabrizia Ghezzo, Xiao Wei Fang, Zhi Ya Zhao, Ruo Peng Liu
• Keywords: Dielectric Ceramics, Dielectric Glasses, Microwave Filters, Microwave Resonators

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