A novel ceramic matrix composite based on YNbO4-TiO2 for microwave applications

This work presents the dielectric properties of YNbO4 (YNO)-TiO2 composites in the microwave range. X-ray diffraction analysis demonstrates that the addition of TiO2 to YNO results in the formation of a Y(Nb0.5Ti0.5)(2)O-6 phase. In the microwave range, the values of permittivity and dielectric loss did not present major changes with the increment of TiO2. Moreover, the addition of TiO2 results in an improvement in the thermal stability of YNO, with YNO63 demonstrating a resonant frequency of -8.96 ppm.degrees C-1. We utilised numerical simulations to evaluate the behaviour of these materials as dielectric resonator antennae and it is found that they exhibit a reflection coefficient below 10 dB at the resonant frequency, with a realised gain of 4.94 - 5.76 dBi, a bandwidth of 665-1050 MHz and a radiation efficiency above 84%. Our results indicate that YNO-TiO2 composites are interesting candidates for microwave operating devices.