SÍNTESE E CARACTERIZAÇÃO DA CERÂMICA CaBi4T i4O15 (CBT) APLICADO A UMA ANTENA RESSOADORA DIELÉTRICA

Lucas Freitas Ximenes, Antônio Alan Rodrigues de Araújo, Ismael Araújo Ramos, Edmar Miranda Ávila Júnior, Múcio Costa Campos Filho, Guilherme Francisco de Morais Pires Júnior

DOI: 10.14209/sbrt.2017.212

Evento: XXXV Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT2017)

Keywords: CaBi4T i4O15 X-Ray Diffraction Microwave Radiofrequency Sintering

Abstract

With the recent advances of the telecommunications industry, it is becoming increasingly necessary to develop materials that have high values of dielectric constant, low dielectric loss and good thermal stability. This paper presents the development and characterization of ceramics CaBi4T i4O15 (CBT), material known for its excellent dielectric properties, mainly high dielectric constant values. The ceramic matrix was produced from the conventional ceramic method or solid state method with the use of high energy mechanical milling and thermal treatment. The ceramic matrix was calcined at 800 ◦C for 2 hours and formed into a cylindrical form after grinding for 6 hours. Subsequently the sintering was carried out at 1150 ◦C for 4 hours to promote better densification. X-ray diffraction was used in the characterization and confirmation of the ceramic phase. Antenna analysis was performed using a ground plane monopole and the data were collected on a network analyzer. The results show the resonance frequency at 1.94 GHz and return loss of -40.4 dB. The measurements of dielectric characterization in radiofrequency and microwave, carried out at room temperature, had a high dielectric constant value (r = 154, 6) and a dielectric loss tangent (tan δe) of the order of 10−2 . Therefore, it can be seen that the ceramic matrix presented is potentially applicable in several electronic devices in radiofrequency and as a microwave dielectric resonator antenna.

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