Microwave dielectric properties of Nd(Ti0.5−xZrx)W0.5O4 ceramics for application in antenna temperature sensor

• Published in: Journal of materials science. Materials in electronics 2018-03, Vol.29 (6), p.4717-4723
• Main Authors: Chen, Yih-Chien, Weng, Min-Zhe, Du, Yue-Xuan, Hsiao, Chih-Lung
• Format: Article
• Language: English
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Dielectric properties; Materials Science; Mobile communication systems; Optical and Electronic Materials; Patch antennas; Permittivity; Q factors; Sintering; Temperature sensors
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-017-8424-y

The microwave dielectric properties of Nd(Ti 0.5−x Zr x )W 0.5 O 4 ceramics were examined with a view to their application in mobile communication. The Nd(Ti 0.5−x Zr x )W 0.5 O 4 ceramics were prepared using the conventional solid-state method. Dielectric constants ( ε r ) of 15.4–19.4 and quality factor ( Q × f ) of 3600–11,100 GHz were obtained for NdTi 0.5 W 0.5 O 4 ceramics at sintering temperatures in the range 1425–1525 °C for 4 h. A maximum density of 6.68 g/cm 3 was obtained for the Nd(Ti 0.47 Zr 0.03 W 0.5 )O 4 ceramic, sintered at 1500 °C for 4 h. A Nd(Ti 0.47 Zr 0.03 W 0.5 )O 4 ceramic that was sintered at 1500 °C for 4 h had a dielectric constant ( ε r ) of 19.8, a quality factor ( Q × f ) of 17,300 GHz, and a temperature coefficient of resonant frequency ( τ f ) of − 54 ppm/°C. The proposed patch antenna sensor had a sensitivity of 0.112 MHz/°C.