LiMSiO4 (M = Ga, Sc and Y): Low-permittivity and high thermal conductivity microwave dielectric ceramics for millimeter-wave communications

doi:10.1016/j.jmst.2024.12.004

Abstract

Abstract: The advancement of millimeter-wave communication desires the ceramic substrate with low permittivity (ԑ_r) to meet the requirements of high transmission rates, low latency and wide bandwidth. However, the thermal conductivity of most low-ԑ_r ceramics is too low to deal with heat dissipation in millimeter-wave applications. In this paper, we reported novel dielectric ceramics LiMSiO₄ (M = Ga, Sc and Y) with excellent performances of low ԑ_r (< 10) and high thermal conductivity (> 6 W mK^-1). Their dielectric properties in both microwave and THz were investigated, where the LiGaSiO₄ ceramic achieved the lowest ԑ_r of ∼5.2, the LiScSiO₄ ceramic presented extremely low loss (Q × f ∼ 96,700 GHz, Q = 1/dielectric loss, f is resonant frequency), and the LiYSiO₄ ceramic showed a positive temperature coefficient of f (TCF ∼ +32 ppm °C^-1). The distinct dielectric behavior was subsequently studied by structure-performance relationship in terms of M-site cations and bond parameters using bond valence theory, Phillips-Van Vechten-Levine chemical bond theory and so on. Moreover, a 36 GHz microstrip array antenna was designed and simulated using the LiGaSiO₄ ceramic substrate, obtaining high realized gain, high radiation efficiency and low sidelobe. The result demonstrated the great potential of LiMSiO₄-type dielectric ceramics in millimeter-wave communications.

Key words: Low permittivity, Thermal conductivity, Microwave dielectric properties, Millimeter wave, Array antenna

Wei Wang, Jian Bao, Changhao Wang, Guoqiang He, Xin Wang, Diming Xu, Biaobing Jin, Zhongqi Shi, Moustafa Adel Darwish, Yawei Chen, Qixin Liang, Meirong Zhang, Di Zhou. LiMSiO₄ (M = Ga, Sc and Y): Low-permittivity and high thermal conductivity microwave dielectric ceramics for millimeter-wave communications[J]. J. Mater. Sci. Technol., 2025, 225: 288-296.

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LiMSiO₄ (M = Ga, Sc and Y): Low-permittivity and high thermal conductivity microwave dielectric ceramics for millimeter-wave communications

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