High-frequency High-q Nickel-zinc Ferrite Materials And Their Device Applications

Along with the development of 21 centuries' information technical and digitalization of electronic products,put forward new request to soft magnetic ferrite materials and devices,such as miniaturization,wide band,high performance and low-loss of the device.Soft magnetic ferrite materials will develop with miniaturization and wide band.This thesis is selected and researched,in combination with this tendency and needs.High frequency and Q-factor NiZn ferrite materials in this dissertation have been prepared by Q-factor solid-phase reaction.Through optimizing of the main formulation, confirm that when the content of Fe₂O₃ is 50mol%,the material has better Q-factor, frequency range of Q-factor can be adjusted by the content of ZnO.The optimally craftwork is gained based on the research of pre-sinter experiments,ball-milling time, sintering temperature,the speed of heating-up and cooling.then we research the effect of a small amount addition of many different oxides on the magnetic parameters of high permeability Ni-Zn ferrite were investigated.We discover that a higher Q-factor can be acquired by a small amount addition of MnO₂,V₂O₅,SiO₂ and mixture of high valence ion,when adding a little amount of MnO₂,the Q-factor of the material enhance observably,these additives make the Q-factor of material moves to high frequency, improve material's function when used in high frequency.The device that created with high frequency and Q-factor NiZn ferrite materials extensive applied at each realm.In this thesis,based on the filter design theories and the transmission line transformer theory,use the high frequency and Q-factor NiZn ferrite material for the basic component,design and research mains filter and power combiner/divider,and test characteristic curve of them,in order to represent the application and characteristics of material,and validate the material's performance.