Research On Dielectric-Loaded Power Divider Based On SISL Platform

RF power divider is an important part of the modern communication system,and its loss,circuit size,and circuit cost have a significant impact on the performance of the entire RF front-end devices.In recent years,many scholars have proposed a variety of methods on circuit miniaturization,such as loading lumped components,using defected grounded structure(DGS),loading metamaterials and so on.However,some of these methods cannot be applied to higher frequencies,and some have a complicated design process,and some are of high cost.Besides,the measurement of microwave devices is an indispensable part of the circuit design process.However,the measurement process of specific microwave devices is relatively cumbersome.Therefore,this paper aims at the above two problems that need to be solved urgently.Based on the Substrate Inte-grated Suspended Line(SISL)platform,this dissertation studies the design and auto-matic measurement of the dielectric-loaded miniaturized power divider.The main con-tent of this dissertation includes the following three aspects:1.Research on the characteristic of SISL-based dielectric-loaded structure.In order to solve the problem of circuit design based on SISL,this dissertation proposes an SISL ring resonator to extract structural characteristic parameters.On the one hand,the SISL ring resonator extract and compare the effective permittivity and unloaded Q value of different patterned substrate,which proves the use of dielectric removal and metal-via hole connection can reduce the loss;on the other hand,the effective permittivity of the dielectric loaded SISL structure can reach 25.15,which can realize the miniaturization of the circuit.2.Design a miniaturized power divider based on dielectric-loaded SISL.In order to solve the problem of large circuit area of traditional Wilkinson power divider,this dissertation proposes a miniaturized power divider based on dielectric-loaded slow-wave SISL structure.Based on the characteristic parameters of the previous work,a dielectric-loaded slow-wave structure is designed to replace the 1/4 wavelength trans-mission line of the traditional Wilkinson power divider to achieve the miniaturization of the circuit area.Based on this method,the working center frequency of the power divider is 3.5 GHz,the 20 d B bandwidth is 30.60%,and the circuit area is 0.068 λ_g×0.138 λ _g.Compared with the traditional Wilkinson power divider based on the SISL structure,the circuit area is reduced 91.88%.3.Build an automatic measurement platform for SISL power dividers:Aiming at the problems of the complicated measured process of specific multi-port devices,this paper builds a set of automatic test platforms for dielectric-loaded power divider.The automatic measurement platform is based on the Lab Windows/CVI development envi-ronment,which enables the vector network analyzer to complete the measurement of the power divider within 5 seconds and realize the automatic acquisition,processing,and recording of parameters.