Novel Temperature‐Stable (1‐ <i>x</i> )Ba <sub>3</sub> V <sub>2</sub> P <sub>3</sub> O <sub>15</sub> ‐ <i>x</i> BaV <sub>2</sub> O <sub>6</sub> Composite Ceramics with Ultralow Sintering Temperature and Low Dielectric Loss for Dielectric Resonator Antenna Applications
Chang‐Hao Wang, Kaiheng Zhang, Jian Bao, Jia‐Pei Jiang, Di‐Ming Xu, Chao Du, Li‐Xia Pang, Tao Zhou, Kar Ban Tan, Di Zhou
Abstract
Abstract The phase composition, crystal structures, dielectric properties, and thermal characteristics of novel (1‐ x )Ba 3 V 2 P 3 O 15 ‐ x BaV 2 O 6 (0 ≤ x ≤ 1) composite ceramics are systematically investigated. The composite ceramics are rationally designed by combining novel Ba 3 V 2 P 3 O 15 ceramics with BaV 2 O 6 ceramics, enabling the regulation of microwave dielectric properties. Experimental results demonstrate that pure‐phase Ba 3 V 2 P 3 O 15 ceramics sintered at 720 °C for 2 h exhibit outstanding microwave dielectric properties: permittivity ( ε r ) = 7.5, quality factor ( Q × f ) = 25 920 GHz (at 12.22 GHz), and temperature coefficient of resonant frequency ( τ f ) = −38 ppm °C −1 . Notably, 0.2Ba 3 V 2 P 3 O 15 ‐0.8BaV 2 O 6 ceramics sintered at 580 °C for 2 h achieve excellent microwave dielectric properties: ε r = 10.0, Q × f = 21 600 GHz (at 10.92 GHz), and τ f = +3.5 ppm °C −1 . Additionally, 0.2Ba 3 V 2 P 3 O 15 ‐0.8BaV 2 O 6 ceramics exhibit superior terahertz dielectric performance, highlighting significant potential for terahertz applications. Furthermore, 0.2Ba 3 V 2 P 3 O 15 ‐0.8BaV 2 O 6 ceramics show favorable compatibility with Al electrodes, demonstrating significant potential for ultralow temperature co‐fired ceramic (ULTCC) application. A cylindrical dielectric resonator antenna (DRA) element is designed using 0.2Ba 3 V 2 P 3 O 15 ‐0.8BaV 2 O 6 ceramics, exhibiting a high radiation efficiency of 88.7% and a peak realized gain of 5.56 dBi. Both simulated and measured performances of the DRA are exceptional, indicating its promising applicability in 5.8 GHz Wi‐Fi communication systems.