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RISS 인기검색어
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- 저자 : Shalini Bahel (검색결과 2 건)
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Low loss dielectric ceramics for microwave applications: a review
S. Bindra Narang,Shalini Bahel 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.3
Microwave dielectric ceramics have been used for a wide range of applications from wireless communication (including mobile communication, ultra high speed local area networks, intelligent transport system, satellite communication) to consumer electronic products. The need for portable, light weight and multifunctional electronic components has forced scientists to search for new advanced microwave materials. During the past 25 years, a large number of dielectric materials have been developed and the properties of existing materials have been improved. However, the data on these very useful materials are scattered. The main purpose of this review is to bring together the data of low loss microwave dielectric ceramics and classify them according to their applications. This should be of immense help to researchers and technologists all over the world.
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Synthesis and microwave characterization of Bi- substituted barium lanthanum titanate
S. Bindra Narang,Shalini Bahel,Dalveer Kaur 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.5
Bi-substituted barium lanthanum titanates with the general formula Ba4(La(1-z)Biz)9.33Ti18O54 where z = 0.0 to 0.2 in steps of 0.05 were synthesized by a conventional mixed oxide route. The composition and morphology were determined using scanning electron microscopy (SEM) and X-ray powder diffraction analysis (XRD). Two dielectric performance parameters, namely dielectric constant and loss tangent were measured with varying microwave frequency in the range 0.3 to 3 GHz at room temperature. It was observed that the dielectric constant and loss tangent both increased initially for z ≤ 0.10 and then decreased. The best properties were obtained for z = 0.20 with a dielectric constant of 91.4 and loss tangent of 0.004. This could be a promising microwave material with a high dielectric constant and low loss. Bi-substituted barium lanthanum titanates with the general formula Ba4(La(1-z)Biz)9.33Ti18O54 where z = 0.0 to 0.2 in steps of 0.05 were synthesized by a conventional mixed oxide route. The composition and morphology were determined using scanning electron microscopy (SEM) and X-ray powder diffraction analysis (XRD). Two dielectric performance parameters, namely dielectric constant and loss tangent were measured with varying microwave frequency in the range 0.3 to 3 GHz at room temperature. It was observed that the dielectric constant and loss tangent both increased initially for z ≤ 0.10 and then decreased. The best properties were obtained for z = 0.20 with a dielectric constant of 91.4 and loss tangent of 0.004. This could be a promising microwave material with a high dielectric constant and low loss.
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