The microwave dielectric properties of Mg 2 (Sn 1−x Ti x )O 4 ceramics were examined with a view to their exploitation as a temperature sensor. Mg 2 (Sn 1−x Ti x )O 4 ceramics were prepared by the conventional solid-state method with various sintering temperatures. X-ray diffraction patterns of the Mg 2 (Sn 0.97 Ti 0.03 )O 4 ceramic revealed no significant variation of the phase with the sintering temperature. An apparent density of 4.54 g/cm 3 , a dielectric constant (ε r ) of 8.3, quality factor (Q × f ) of 75000 GHz, and a temperature coefficient of resonant frequency (τ f ) of −57 ppm/℃ were obtained for the Mg 2 (Sn 0.97 Ti 0.03 )O 4 ceramic that was sintered at 1550 ℃ for 4 h. The development procedure and test results for a dielectric resonator antenna temperature sensor are also reported. The resonating frequency measured at 25 ℃ was 17.32 GHz and a sensitivity of −0.97 MHz/℃ was successfully achieved.
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