论文标题
名义上的副陶瓷中的极地纳米簇展示了无线通信的高微波可调性
Polar nano-clusters in nominally paraelectric ceramics demonstrating high microwave tunability for wireless communication
论文作者
论文摘要
介电材料在微波频率下具有高可调性，是微波通信系统设计中的关键组成部分。为了通过极性纳米簇效应优化介电可调性，准备了具有不同晶粒尺寸的密集BA0.6SR0.4TIO3（BST）陶瓷。介电介电常数和损耗测量在高频和低频下进行，并得到X射线粉末衍射，扫描和透射电子显微镜，拉曼光谱和压电响应力显微镜的结果。极地纳米簇的浓度，其大小在20至50 nm的范围内，并且介电可调性随着晶粒尺寸的增加而增加。提出了一种测量微波可调性的新方法。在平均晶粒尺寸为10 um的陶瓷中，可调节性最高的可调性最高。 BST陶瓷具有施加DC场的可调性在小的谐振天线中证明。
Dielectric materials, with high tunability at microwave frequencies, are key components in the design of microwave communication systems. Dense Ba0.6Sr0.4TiO3 (BST) ceramics, with different grain sizes, were prepared in order to optimise the dielectric tunability via polar nano cluster effects. Dielectric permittivity and loss measurements were carried at both high and low frequencies and were supported by results from X-ray powder diffraction, scanning and transmission electron microscopies, Raman spectroscopy and piezoresponse force microscopy. The concentration of polar nano clusters, whose sizes are found to be in the range 20 to 50 nm, and the dielectric tunability increase with increasing grain size. A novel method for measurement of the microwave tunability in bulk dielectrics is presented. The highest tunability of 32% is achieved in ceramics with an average grain size of 10 um. The tunability of BST ceramics with applied DC field is demonstrated in a prototype small resonant antenna.
