New Microwave Dielectric Ceramic Materials

该小型企业创新研究第一阶段项目将解决用于移动的电话和其他电信应用的微波介质谐振器的陶瓷材料的合成和加工。使命研究公司（MRC）提议对一种新的铋基介电材料家族进行研究，该材料具有减小陶瓷谐振器尺寸的潜力，同时提高谐振器性能。这些新的电介质陶瓷也可以在低温下烧结，从而允许低成本的多层器件制造和最终集成到共烧微波集成电路中。在以前的研究中，MRC确定了一系列铋基陶瓷组合物，这些组合物具有高介电常数，低微波介电损耗和谐振频率的温度补偿。这些特性是移动的电话中使用的介质谐振器所期望的。第一阶段项目的主要目标是建立在高介电常数和温度稳定的介电陶瓷中提供低微波介电损耗的成分和加工方法。在这个项目中，将制备和评估几种陶瓷组合物。这些陶瓷的晶体化学，介电性能和微波介电损耗的组成和陶瓷加工的影响将被确定。在第一阶段项目结束时，将确定在微波介质谐振器器件中使用这些新的介质陶瓷的可行性。第一阶段的研究将为第二阶段的进一步成分和工艺优化以及原型谐振器制造提供基础。

This Small Business Innovation Research Phase I Project will address the synthesis and processing of ceramic materials for microwave dielectric resonators used in mobile telephones and other telecommunications applications. Mission Research Corporation (MRC) proposes to conduct research on a new family of bismuth-based dielectric materials, with potential for reducing the size of ceramic resonators while improving resonator performance. These new dielectric ceramics also can be sintered at low temperature, thus allowing low-cost multilayer device fabrication and eventual integration into co-fired microwave integrated circuitry. In previous research, MRC identified a family of bismuth-based ceramic compositions that offer high permittivity, low microwave dielectric loss, and temperature-compensation of the resonant frequency. These properties are desired for the dielectric resonators used in mobile telephones. The primary objective of this Phase I project is to establish compositions and processing methods that provide low microwave dielectric loss in high-permittivity and temperature-stable dielectric ceramics. In this project, several ceramic compositions will be prepared and evaluated. The effects of composition and ceramic processing on the crystal chemistry, dielectric properties, and microwave dielectric loss of these ceramics will be determined. At the conclusion of this Phase I project, the feasibility of using these new dielectric ceramics in microwave dielectric resonator devices will be established. The Phase I research will provide a basis for further compositional and processing optimization and prototype resonator fabrication in Phase II.