We have studied the effect of addition of titania, as a sintering agent, to alumina on the dielectric characteristics of the ceramic composites obtained. The dielectric properties of the titania-alumina composites were studied by use of impedance spectroscopy and the Hakki-Coleman method in the radiofrequency and microwave regions, respectively. The temperature coefficient of the resonant frequency (s f ) was also studied. Dielectric permittivity (e¢) was increased and the dielectric loss (tan d) was improved by addition of titania, as a result of better sintering; addition of 10 wt.% titania resulted in e¢ = 12.68 and tan d = 8.23 9 10 À4 in the microwave region. Increasing the concentration of TiO 2 led to inversion of the s f signal; values were positive when the concentration of TiO 2 was >7.5 wt.%. The ceramic composites were evaluated as antennas; for all samples the return loss (S 11 ) was <À10 dB and the gain was approximately 3 dBi. Addition of 7.5 wt.% titania to the Al 2 O 3 improved antenna performance. In conclusion, addition of the TiO 2 to alumina improves its dielectric properties, resulting in the possibility of use of such composites as dielectric resonator antennas (DRA).
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