This work presents the dielectric properties of YNbO
4 (YNO)–TiO
2 composites in the microwave range. X-ray diffraction analysis demonstrates that the addition of TiO
2 to YNO results in the formation of a Y(Nb
0.5Ti
0.5)
2O
6 phase. In the microwave range, the values of permittivity and dielectric loss did not present major changes with the increment of TiO
2. Moreover, the addition of TiO
2 results in an improvement in the thermal stability of YNO, with YNO63 demonstrating a resonant frequency of ?8.96 ppm.°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–TiO
2 composites are interesting candidates for microwave operating devices.
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