Research And Design Of Multi-band Filtering Power Divider

With the development of wireless communication systems toward miniaturization and high integration,the design of filtering power dividers(FPD)with integrated filtering and power division has become an indispensable trend.In addition,in order to make the application field of the device more widespread,the design of a miniaturized,low-loss dualband filtering power divider has become the research goal of most scholars.In this dissertation,three different types of dual-band filtered power dividers are designed based on a single multimode resonator,and the main work is as follows:(1)A dual-band filtered power divider(DB-FPD)with tunable transmission zeros(TZs)is designed using a single-loop multiple-mode resonator.Firstly,based on a single ring resonator,a dual-band filtering is designed using perturbation technology,and its bandwidth is broadened by stubs loading technology.Secondly,a dual-band filtering power divider with TZs separately controllable TZs was designed by using the fusion method.Finally,the DBFPD with a center frequency of 2.33/4.69 GHz is fabricating measurement.(2)Based on the Stepped Impedance Resonator(SIR),a compact dual-wideband filtering power divider is proposed.First,a "mountain" resonator is used to form a dual-band filtering;To broaden the bandwidth,a pair of open-circuit stubs are loaded.Secondly,using the fusion design method,the two devices are integrated to complete the function of DB-FPD.In addition,a pair of microstrip stubs and sector stubs are loaded on the input feeder to improve the out-of-band selectivity of the dual-band and optimize impedance matching.Moreover,resistors are applied between output ports to improve isolation between their ports.Finally,the DB-FPD with a center frequency of 2.83/4.87 GHz is fabricating measurement.(3)Based on a single stub loaded resonator(SLR),a high-selective dual-band filtering power divider is proposed.Firstly,a dual-band filtering response is formed on the SLR of the "mountain" shape,and its bandwidth is broadened by loading two pairs of stubs on the SLR;Secondly,using the fusion method,a DB-FPD with high selectivity is designed by integrating with Wilkinson power divider.In addition,to improve its out-of-band rejection capability and impedance matching performance,a pair of quarter-wavelength dendrites and a pair of fanshaped dendrites are loaded on the input feed line,respectively.