X-Band Microwave Reflection Properties of Samarium/Bismuth-Substituted Barium Lanthanum Titanate Ceramics

详细信息    查看全文

• 作者：Shalini Bahel ; Kunal Pubby ; Sukhleen Bindra Narang
• 关键词：Sm/Bi ; substituted dielectric ceramics ; X ; band ; microwave reflector ; reflected power ; double ; layer reflectors
• 刊名：Journal of Electronic Materials
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：46
• 期：3
• 页码：1770-1776
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials; Electronics and Microelectronics, Instrumentation; Solid State Physics;
• 出版者：Springer US
• ISSN：1543-186X
• 卷排序：46

文摘

Samarium/bismuth-substituted barium lanthanum titanate ceramics with chemical composition \( {\hbox{Ba}}_{4} ({\hbox{La}}_{1 - y - z} {\hbox{Sm}}_{y} {\hbox{Bi}}_{z} )_{9.33} {\hbox{Ti}}_{18} {\hbox{O}}_{54} \) (y = 0.5, 0.7; z = 0.05, 0.10, 0.15), intended as microwave reflecting materials, have been investigated in microwave X-band (8.2 GHz to 12.4 GHz) and the effect of substitution on their dielectric properties, i.e., dielectric constant and dielectric loss tangent, has been studied by vector network analyzer. Dielectric analysis showed that the dielectric constant increased with increasing samarium as well as bismuth content. Dielectric relaxation was observed for all samples in the scanned frequency range. Microwave reflection and transmission analysis of ceramic pellets of thickness 4 mm was carried out using two methods, i.e., open- and short-circuit approach, both indicating very high values of reflected power and very low values of transmitted power for all the doped materials in comparison with the base composition. The doped compositions are therefore potential microwave shielding materials for use in anechoic chambers, microwave laboratories, and radar equipment. Double-layer reflectors are also proposed, having better reflection properties (∼99% reflection) compared with single-layer reflectors.