کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1623636 | 1516409 | 2009 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High dielectric constant low loss in the (La1/2Na1/2)TiO3-Ca(Mg1/3Nb2/3)O3 ceramic system at microwave frequency
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
The crystal structures and microwave dielectric properties of the x(La1/2Na1/2)TiO3-(1 â x)Ca(Mg1/3Nb2/3)O3 perovskite ceramic system were investigated. The x(La1/2Na1/2)TiO3-(1 â x)Ca(Mg1/3Nb2/3)O3 solid solution exhibited orthorhombic crystal structures for all compositions. As the x value increased from 0.2 to 0.8, the dielectric constant Ér increased from 38.24 to 96 and the unloaded quality value Q Ã f decreased from 42,500 to 12,800 GHz. The temperature coefficient of the resonant frequency (Ïf) varied from â20 to 138 ppm/°C as the x value increased from 0.2 to 0.8. A new microwave dielectric material, 0.4(La1/2Na1/2)TiO3-0.6Ca(Mg1/3Nb2/3)O3, is suggested for microwave devices, having a dielectric constant Ér of â¼52.33, a Q Ã f value of â¼29,700 (at 6.0 GHz), and a Ïf value of â¼2 ppm/°C. It is proposed as a suitable candidate material for small-sized GPS patch antennas.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 468, Issues 1â2, 22 January 2009, Pages L13-L16
Journal: Journal of Alloys and Compounds - Volume 468, Issues 1â2, 22 January 2009, Pages L13-L16
نویسندگان
Cheng-Liang Huang, Shih-Sheng Liu, Chung-Chin Chen,