Estudo das propriedades dielétricas da matriz cerâmica Ba(Zn1/3Ta2/3)O3 dopada com ZnO2 ou Cr2O3 para aplicações em componentes de micro-ondas

Abstract

The expansion of wireless telecommunications networks and the phenomenon of digital convergence bring the inherent need for research into new components that ensure the sustainability and evolution of systems. New types of antennas, smaller and more efficient, are required as new devices emerge. In this scenario, dielectric resonating antennas, built from new materials, appear as an excellent choice to replace traditional metal antennas. This work presents the study of the dielectric properties of the Ba(Zn1/3Ta2/3)O3(BZT) ceramic matrix added with ZnO2 or Cr2O3, obtained by the new solid-state method, with a view to its application as a microwave component. The characterization in this frequency range is performed with the use of Hakki-Coleman and monopole measurement methods. As far as the monopole measurement is concerned, a single probe feed scheme is used to excite the HEM114 mode in the cylindrical dielectric mode. For this, concepts of electromagnetic theory involving resonant cavities and dielectric characteristics of the ceramic materials that compose the resonator are introduced. In addition, the computational simulation processes and aspects of the prototype are discussed. The results are discussed comparatively between the computational simulation model and those produced experimentally in the laboratory. In the study, a good agreement between the numerical and experimental results was observed, evidencing the technical feasibility of the material to operate as an antenna. Another explored aspect of the resonator is its thermal stability, a must-have feature for microwave devices.