Ultra-low temperature sintered (1-x)BaV2O6-xLiF ceramics for ULTCC and 5 G millimeter-wave antenna applications

(1-x)BaV2O6-xLiF (x = 0.025, 0.05, 0.10, 0.15) ceramics with an ultra-low sintering temperature of 475 degrees C were synthesized using the standard solid-state reaction method. The ceramics demonstrated a remarkable enhance-ment in the quality factor (Qf), reaching a maximum value of 16,800 GHz at x = 0.10, which is 5.6 times higher than that of pure BaV2O6 ceramics obtained in this work. A near-zero temperature coefficient of resonant fre-quency (zf = 1.44 ppm/degrees C) was simultaneously achieved, together with a dielectric constant er of 11.54. Additionally, the chemical compatibility between the present ceramics and the Al electrode was confirmed. Moreover, a millimeter-wave antenna with an excellent S11 value of-50.3 dB, and a large bandwidth of 3.44 GHz was fabricated using the 0.9BaV2O6-0.1LiF ceramic as the dielectric resonator. These results highlight the potential application prospects of (1-x)BaV2O6-xLiF ceramics in the ultra-low temperature co-fired ceramic technology and 5 G millimeter-wave antennas.

Automated summary

(1-x)BaV2O6-xLiF ceramics with an ultra-low sintering temperature of 475 degrees C were synthesized using the solid-state reaction method. The ceramics showed a significant enhancement in the quality factor (Qf) and a near-zero temperature coefficient of resonant frequency (zf). The 0.9BaV2O6-0.1LiF ceramic exhibited excellent properties as a dielectric resonator, including a high Qf value of 16800 GHz, a low zf value of 1.44 ppm/degrees C, and a dielectric constant er of 11.54. The compatibility with the Al electrode was confirmed, and a millimeter-wave antenna with good performance was fabricated. These findings highlight the potential applications of (1-x)BaV2O6-xLiF ceramics in ultra-low temperature co-fired ceramic technology and 5G millimeter-wave antennas.