ABSTRACT In this paper, a novel Na 2 BaNi(PO 4 ) 2 (NBNP) ceramic was successfully synthesized via the solid‐state reaction method. The ceramic possesses a glaserite‐type structure with a space group of P (No. 147), as confirmed by XRD and Raman spectrum. In the microwave frequency band, the NBNP ceramic exhibits excellent performance: ε r = 8.19 ± 0.26, Q × f = 45 662 ± 1375 GHz (at 10.35 GHz), and τ f = −11.97 ± 2.52 ppm/°C. The Q × f shows potential for improvement with the frequency extended to the terahertz (THz) and far‐infrared bands, indicating its promising application prospects in the field of high‐frequency communications. In addition, the co‐firing results with 20 wt% Ag demonstrated that the NBNP ceramic can achieve good compatibility at 750°C. Finally, a patch antenna operating at 3.64 GHz was designed using NBNP ceramic as the substrate, which shows a bandwidth of 100 MHz and an S 11 value of −35.5 dB, demonstrating that the NBNP ceramic is an ideal candidate material suitable for high‐frequency communication applications.
Sun et al. (Wed,) studied this question.