Structural, microwave dielectric properties and dielectric resonator antenna studies of Sr(Zr_÷Ti_(1-÷))O_3 ceramics

摘要

Compositionally induced phase transitions in the system Sr(Zr_÷Ti_(1-÷))O_3 were analyzed using a combination of X-ray diffraction, FT-Raman and FTIR spectroscopy. Sr(Zr_÷Ti_(1-÷))O_3 system showed at least two tilting of phase transitions, pm3m-I4mcm and I4/mcm-pnma. The structural transition occurred due to tilting of BO_6 octahedra. Dielectric constant measured with Hakki-Coleman technique decreased from 253 to 25 with increase of Zr content. The value of ?_f found 1771 ppm/°C for SrTiO_3 which decreased to -82 ppm/°C for the SrZrO_3. The dielectric resonator antenna (DRA) was investigated experimentally and numerically using a monopole antenna through an infinite ground plane and Ansoft's high frequency structure simulator software, respectively. The required resonance frequency and bandwidth of DRA were investigated in the composition between 0 ≤ x ≤ 1.0.