کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11007786 | 1840506 | 2019 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High thermal stability OF Li2TiO3-Al2O3 composite in the microwave C-Band
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this study, we analyzed composites based on Li2TiO3-Al2O3 in the microwave range by measuring their dielectric properties comprising the temperature coefficient of the resonant frequency (Ïf), relative dielectric permittivity (εr), and dielectric loss (tanδ) in the C band (4-8â¯GHz). The Li2TiO3 phase was obtained by solid-state reaction and the ceramic composites were obtained by blending phase 2 with 5, 10, 15 and 20â¯wt% of Al2O3. We then analyzed these ceramic composites as dielectric resonator antenna. The results showed that the alumina addition of 5â¯wt% improved the Ïf value for the composites (Ïfâ¯=â¯â0.58â¯ppmâ¯Â°Câ1) but the other dielectric properties did not improve with the alumina concentration, where the permittivity decreased and the dielectric loss increased. According to the antenna measurements, all of the samples exhibited good performance in terms of the gain (3.91-5.67 dBi), bandwidth (338-500â¯MHz), and efficiency (70.58-96.84%) compared with previous findings.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Physics and Chemistry of Solids - Volume 125, February 2019, Pages 51-56
Journal: Journal of Physics and Chemistry of Solids - Volume 125, February 2019, Pages 51-56
نویسندگان
V.C. Martins, R.G.M. Oliveira, F.F. Carmo, M.A.S. Silva, S.A. Pereira, J.C. Goes, M.M. Costa, D.X. Gouveia, A.S.B. Sombra,