宽带多频射频理论与技术OA

The trend toward parallel multi-service operation in wireless mobile communication systems has led to increasingly fragmented spectrum resources and an exponential rise in the number of RF channels,making multi-band RF circuit techniques a critical challenge.This paper presents the research progress of our group in broadband multi-band theories and methodologies,alongside the developmental roadmap for corresponding RF devices.First,the theoretical framework for multi-band impedance matching is reviewed,summarizing matching techniques for three distinct scenarios:dual-band real impedance,constant complex impedance,and frequency-dependent complex impedance.Building upon this foundation,the design and implementation of multi-band passive components,including filters,power dividers,couplers,and antennas are introduced.Furthermore,the design of multi-band active amplifier circuits and their simplified linearization methods are discussed.Currently,dual-band circuit design and fabrication encompass a comprehensive range of active and passive circuits,featuring frequency separations exceeding two to three octaves and a cumulative dual-band bandwidth of up to 1.1 GHz.Significant progress has also been made in tri-band circuit design and realization,and a variety of representative tri-band active and passive circuits have been implemented.Finally,the paper discusses future development trends in multi-band RF technologies.