A Novel Temperature-Compensated Microwave Dielectric (1−x)(Mg0.95Ni0.05)TiO3−xCa0.6La0.8/3TiO3 Ceramics System |
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| Authors: | Chun-Hsu Shen Cheng-Liang Huang Chuan-Feng Shih Chih-Ming Huang |
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| Affiliation: | Department of Electrical Engineering, National Cheng Kung University, Tainan 70101, Taiwan |
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| Abstract: | The microstructure and microwave dielectric properties of a (1? x )(Mg0.95Ni0.05)TiO3? x Ca0.6La0.8/3TiO3 ceramics system have been investigated. The system was prepared using a conventional solid-state ceramic route. In order to produce a temperature-stable material, Ca0.6La0.8/3TiO3 was added for a near-zero temperature coefficient (τf). With partial replacement of Mg2+ by Ni2+, the dielectric properties of the (1? x )(Mg0.95Ni0.05)TiO3? x Ca0.6La0.8/3TiO3 ceramics can be promoted. The microwave dielectric properties are strongly correlated with the sintering temperature and the composition. An excellent Q × f value of 118,000 GHz can be obtained for the system with x =0.9 at 1325°C. For practical application, a dielectric constant (?r) of 24.61, a Q × f value of 102,000 GHz, and a temperature coefficient of resonant frequency (τf) of ?3.6 ppm/°C for 0.85(Mg0.95Ni0.05)TiO3?0.15Ca0.6La0.8/3TiO3 at 1325°C are proposed. A parallel-coupled line band-pass filter is designed and simulated using the proposed dielectric to study its performance. |
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