Research On The Comprehensive Design Of RF Front-end Multi-channel Power Division Filter

With the global popularity of wireless mobile terminals,modern wireless communication technologies continue to improve,and higher requirements are placed on radio frequency front-end systems.Therefore,in order to cater to this development trend,on the RF front-end system platform with limited size,miniaturized electromagnetic wave RF front-end devices with excellent performance are the key goals pursued by the development of modern wireless communication technology.In order to better realize the important functions of the radio frequency front-end circuit,the multi-way filtering power divider integrates multi-way power distribution and frequency selection functions into a new electromagnetic wave device.Because of its good performance advantages,it has attracted more and more attention in recent years.However,due to the increasingly complex standards of modern wireless terminal equipment and communication systems,the existing research on multi-way filtering power divider is insufficient and there are few comprehensive design methods.In view of this,this thesis aims to study the modeling and comprehensive design of electromagnetic wave radio frequency multi-way filtering power divider.The specific research content mainly includes the research on the new construction method of multiway filtering power divider network coupling topology model,the research of multiway filtering power divider network unit,accurate and efficient comprehensive design of the new power division filter network.The specific research content of this thesis is as follows:1.Based on the new butterfly network coupling topology,two four-way filtering power dividers are designed.Based on the microstrip transmission line technology,with the help of filter network analysis theory and transmission line theory,in-depth research on the new comprehensive theory and design of multi-way filtering power divider network in the form of planar microstrip.Combined with the proposed coupling topology,using the same type of multimode resonator and isolation resistor to achieve good filter response and isolation performance,four-way single/dual passband filtering power divider and triple band filtering power divider are designed.In addition,the proposed novel butterfly network coupling topology has a high degree of flexibility,and can be further extended to other novel multi-way filtering power divider circuit designs by employing different resonant units.Provide a new multi-way coupling topology model,filter network unit and theoretical basis for the design of a highperformance,miniaturized multi-way filtering power divider.2.Based on the star network coupling topology,a general design method suitable for odd and even way,in-phase and out-of-phase filtering power divider is proposed,and three multi-way filtering power dividers are designed.Using the proposed topology model,effectively combining the theoretical analysis of the filter network and the transmission line,the realization mechanism of the star-style multi-way filtering power divider coupling topology and the electromagnetic characteristics of the coupling transmission structure under the planar microstrip form are explored gradually.Using odd-even mode analysis method to derive theoretical formulas,study the working mechanism of the circuit,design the in-phase three/four-way filtering power divider,and combined with the voltage distribution characteristics of the half-wavelength transmission line to design the inverted four-way filtering power divider.According to the design steps,three-dimensional modeling electromagnetic simulation,circuit processing and physical testing are carried out to verify the effectiveness of the design and provide a reliable theoretical support for the design of a multi-way filtering power divider with excellent performance.