The microstructures and microwave dielectric properties of the novel temperature-compensated composite ceramic (1Àx)(Mg 0.95 Ni 0.05 )TiO 3 -x(La 0.5 Na 0.5 )TiO 3 were investigated. Dense and mixed phase samples were produced in the range of 0.05rxr0.9. When the x value increased, the quality factor (Q Â f) decreased nonlinearly while the dielectric constant (e r ) steadily increased almost linearly due to the compensation effect. The temperature coefficient of resonant frequency (t f ) was remarkably improved with an increase of (La 0.5 Na 0.5 )TiO 3 content. With x 5 0.13, a dielectric constant (e r ) of 23.22, a Q Â f value of 86,500 GHz, and a t f value of 2.8 ppm/1C was obtained for 0.87(Mg 0.95 Ni 0.05 )TiO 3 -0.13(La 0.5 Na 0.5 )TiO 3 ceramics sintered at 12751C for 4 h. Moreover, a band-pass filter with traditional hairpin resonators with a center frequency of 2.4 GHz was designed and fabricated using the proposed dielectric ceramic to study its performance.
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