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Study of the performance of dielectric resonator antennas based on the matrix composite of Al 2 O 3 – CaTiO 3
Author(s) -
Oliveira L. S.,
Gouveia D. X.,
Silva M. A. S.,
Sombra A. S. B.
Publication year - 2015
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28999
Subject(s) - materials science , dielectric , calcium titanate , dielectric resonator , composite number , dielectric resonator antenna , dielectric loss , microwave , ceramic , temperature coefficient , permittivity , resonator , composite material , optoelectronics , telecommunications , computer science
In this article is present the structural and dielectric microwave properties of Alumina – CaTiO 3 ceramic composite with the addition of CaTiO 3 and your performance as a dielectric resonator antenna (DRA). Alumina has a negative temperature variation of resonant frequency coefficient τ f , while CaTiO 3 has a high positive temperature coefficient. Also influence of calcium titanate on densification and porosity of the composite is presented. The CaTiO 3 was added (2.5% to 10% wt. amount) in order to analyze changes in the dielectric properties. Samples were characterized by X‐ray diffraction. Dielectric properties were investigated by Hakki‐Coleman methods and the experimental characteristics parameters like return loss, bandwidth, and input impedance are presented and compared with numerical simulations. The results obtained shows the formation of secondary phases (Hibonite and TiO 2 ), with the dielectric permittivity and dielectric loss increasing and decreasing with calcium titanate concentration, respectively. The application of DRA was verified and all samples tested presented return loss below −10 dB in the resonant frequency. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:963–969, 2015