研究一种微波频段三维电磁带隙(Electromagnetic band gap,EBG)结构的快速成型方法。该方法结合光固化成型技术与凝胶注模工艺,以光固化快速成型技术制造金刚石结构的负型模具,凝胶注模工艺成型陶瓷零件,可用于制备三维金刚石电磁带隙结构;微波频谱测试表明,制备得到的EBG的带隙范围在10.24～12.22 GHz,与理论计算的带隙一致;用Micro-CT三维重建显示,内部结构连续完整,线性密度均匀稳定,制造和测试结果显示基于光固化的制造方法能够实现三维EBG的快速、精确制造并展示其真实微波传输特性。采用光固化成型与凝胶注模相结合的制备工艺为三维EBG结构快速制备及其性能研究提供了一条有效途径。
In the present work,a novel low temperature-ring Bi_(3)FeMo_(2)O_(12) ceramic was synthesized via the solid-state reaction method.The monoclinic Bi_(3)FeMo_(2)O_(12) phase can be formed at a low temperature 670℃.A relative density above 96%can be obtained when sintering temperature is above 800℃.The Bi_(3)FeMo_(2)O_(12) ceramic sintered at 845℃ for 2 h shows high microwave dielectric performance with a permittivity-27.2,a Qf value of 14,500GHz and a temperature coefficient of-80 ppm/℃.It might be a candidate for low temperature co-fired ceramics technology.
DI ZHOULI-XIA PANGJING GUOYING WUGAO-QUN ZHANGHONG WANGXI YAO
