Microwave dielectric properties and antenna simulation of Li2MoO4-BaV2O6 ceramics with low sintering temperature

With the rapid development of 5G communication technology, higher requirements have been imposed on microwave dielectric ceramic materials. Ceramic materials with low dielectric constant, excellent temperature stability, and low sintering temperature have become current research focus. In this study, (1-x)Li₂MoO₄-xBaV₂O₆ (LM-xBV, x = 0.7, 0.78, 0.8, 0.9) ceramics were successfully prepared via the solid-state reaction method, and their microstructures, microwave dielectric properties and antenna simulation were investigated. XRD and Raman spectroscopy confirmed the coexistence of BaV₂O₆, BaMoO₄ and LiVO₃ phases in all LM-BV systems. Bulk density, Q × f and τ_f values approximately increased, and ε_r decreased, with BV contents increased at optimum sintering temperature. LM-0.8BV ceramic was obtained with excellent microwave dielectric properties of ε_r = 9.32, Q × f = 11246.3 GHz and τ_f = 2.8 ppm/ ℃. The DRA designed based on Li₂MoO₄-0.8BaV₂O₆ ceramics demonstrated excellent performance at 7.88 GHz, including a return loss of ~ -33.51 dB, high efficiency (~ 95%), a peak gain of ~ 7.3 dB, and a bandwidth of 500 MHz. These results indicated that the material had promising potential for applications in microwave devices within Low-Temperature Co-fired Ceramic (LTCC) technology.