铋基立方焦绿石材料具有适中的介电常数、较高的介电调谐率，尤其是极低的介电损耗，是一种非常有前途的新型微波介质可调材料。这类材料的介电调谐性与其结构中的A-位无序离子有关。本项目采用磁控溅射方法制备铋基焦绿石薄膜，分别通过半径小、极化率高的A-位离子取代，研究材料中的无序度和偶极矩对铋基焦绿石材料介电调谐性的影响，有望开发出具有高可调、低损耗、性能稳定的新型铋基焦绿石材料。采用单端口和双端口两种不同的微波性能分析方法，研究铋基焦绿石材料微波频段下的介电损耗行为，为该类材料在5G通信系统中的应用提供可靠的设计参数。

Bismuth based cubic pyrochlores have moderate dielectric constant, high electric-field dielectric tunability, especially the low dielectric loss, which make them promising candidates for microwave dielectric tunable applications. The dielectric tunable properties of bismuth based pyrochlores are concerned with the disordered ions on A-sites. In this research, the stable structures and dielectric properties of bismuth based pyrochlores are substituted by the ions with small radius and high polarizability on the A-sites are investigated for defining how the randomness and dipole moments affect the dielectric tunability of bismuth based pyrochlore materials. This study will develop a new bismuth based pyrochlore thin films with high dielectric tunability, low dielectric loss and stable dielectric performance. Both the one-port and two-ports microwave-testing methods are employed to investigate the microwave dielectric loss behavior of bismuth based pyrochlore materials. Moreover, it will provide reliable design parameters for 5G communication systems.