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High-entropy gallium-based garnet microwave dielectric ceramics with low loss for C-band dielectric resonator antenna application
Author(s)
Wen, Xinyang
Xiang, Huaicheng
Gu, Xiaolong
Pulphol, Phieraya
Tang, Ying
Li, Jie
Qin, Yuandong
Fang, Liang
Date Issued
November 1, 2025
Type
Article
Abstract
In this work, (Y0.5 Nd0.5 Sm0.5 Eu0.5 Ho0.5 Yb0.5 )Ga5 O12 high-entropy ceramic with a cubic garnet structure was designed and synthesized via a solid-state reaction method. Through the high-entropy regulation of the oxygen dodecahedron, the bond strength increases, the cation's bond valence approaches the ideal value, and the structural stability improves, thereby promoting the Q × f value. Low dielectric loss (Q × f = 130,100 GHz) was obtained in the high-entropy ceramic (Y0.5 Nd0.5 Sm0.5 Eu0.5 Ho0.5 Yb0.5 )Ga5 O12 , which exhibited a low relative permittivity (εr ) of 12.36, a negative temperature coefficient of resonant frequency (τf ) of −66.37 ppm/°C, and a high flexural strength of 229.68 MPa. Furthermore, a cylindrical dielectric resonator antenna (CDRA) was designed featuring high radiation efficiency (>90 %) and stable gain (5.91–5.97 dBi) within a 255 MHz bandwidth, showing promising application prospects in the C-band. This work indicates that the high-entropy strategy is feasible for the design of high-performance microwave dielectric ceramics.
Citation
Ceramics International, 51(28), 59000-59007, 2025