The Preparation Of Modified 0.95MgTiO₃-0.05CaTiO₃ Microwave Dielectric Ceramic And Its Application On Microstrip Antenna

In recent years,with the development of wireless communication technology,microwave technology has also developed toward higher frequencies,and the requirements for electronic components are also increasing.It also puts forward higher requirements for the performance of microwave dielectric ceramics.In this thesis,ZnO-doped 0.95MgTiO3-0.05CaTiO3 ceramics is synthesized by traditional solid-state reaction method,and the effects of doping and sintering processes on the ceramic structure and properties are studied.In this thesis,X-ray diffraction(XRD),scanning electron microscope(SEM)and network analyzer are used to deeply analyze and explore the structure,dielectric properties and relationship between them.The design and simulation of the microstrip antenna are also explored.In this thesis,0.95MgTiO3-0.05CaTiO3 composite ceramic samples with different ZnO doping levels are prepared at different sintering temperatures(1290?-1310?)using traditional solid-state reaction methods.In this thesis,the phase composition of 0.95MgTiO3-0.05CaTiO3 composite ceramics is analyzed by XRD,the microscopic morphology of 0.95MgTiO3-0.05CaTiO3 composite ceramics is analyzed by SEM,and the dielectric properties of 0.95MgTiO3-0.05CaTiO3 composite ceramics are analyzed by network analyzer.It is concluded that proper addition of ZnO can reduce the sintering temperature.The optimal dielectric properties are obtained when the amount of ZnO added is 0.25wt%and the sintering temperature is 1310 ?.And the application of 0.95MgTiO3-0.05CaTiO3 composite ceramics in microwave dielectric antennas is explored as well.In this thesis,based on the modified 0.95MgTiO3-0.05CaTiO3 ceramics,two antennas are designed using HFSS electromagnetic simulation software.The simulation results show that when the radiating patch length of the side-fed rectangular microstrip antenna is 12.45mm and the width is 13.4mm,the resonance point is at 2.45GHz,the return loss S(1,1)is-19.63dB,and the maximum radiation direction is in the positive direction of the Z axis,the maximum gain is about 4.95dB.When the radiating patch length of the coaxially fed rectangular microstrip antenna is10.78mm and the width is 18.89mm,the resonance point is at 2.45GHz,the return loss S(1,1)is-14.68dB,and the maximum radiation direction is the Z axis in the positive direction,the maximum gain is about 5.06dB.