移动通信系统正在向着高效率、多频带和宽带化方向发展。作为无线通信的关键器件，射频功率放大器的高效率、多频工作不仅有利于降低射频前端的体积和成本，而且可有效节约能源。本课题针对可同时工作于两个频段的单体共时双频功放的效率提升技术和预失真线性化技术进行研究，力争在支撑高效率共时双频Doherty功放设计的低频率比双频匹配技术、宽带双频匹配技术、双频offset line频率独立的相移控制技术以及单体共时双频功放的建模技术等方面取得理论与技术的创新突破，建立具有普适性的高效率单体共时双频Doherty功放设计理论体系，为单体共时双频功放在移动通信系统中的应用奠定基础。

The mobile communication system is toward the high-efficiency, multi-band and wideband direction. As the key components in wireless communications system, RF power power amplifiers (PAs) operate in high efficiency and multi-band mode will not only help to reduce the size and cost of the RF front-end, and can effectively save energy. This project focuses on the research of mono-concurrent dual-band PAs, include dual-band matching techniques with low center frequency ratio, broadband dual-band matching techniques, frequency-independent phase shift control technology of dual-band offset line and the predistortion behavioral model of mono-concurrent dual-band PAs etc. Strive to obtain the theory and technology innovation and breakthroughs. Establish the universal theory for the design of mono-concurrent dual-band Doherty PAs. Lay the foundation for the application of mono-concurrent dual-band PAs in the mobile communication system.