Publication: High-entropy gallium-based garnet microwave dielectric ceramics with low loss for C-band dielectric resonator antenna application
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Issued Date
2025-11-01
Resource Type
ISSN
02728842
Scopus ID
2-s2.0-105024064358
Journal Title
Ceramics International
Volume
51
Issue
28
Start Page
59000
End Page
59007
Rights Holder(s)
SCOPUS
Bibliographic Citation
Ceramics International Vol.51 No.28 (2025) , 59000-59007
Suggested Citation
Wen X., Xiang H., Gu X., Pulphol P., Vittayakorn N., Tang Y., Li J., Qin Y., Fang L. High-entropy gallium-based garnet microwave dielectric ceramics with low loss for C-band dielectric resonator antenna application. Ceramics International Vol.51 No.28 (2025) , 59000-59007. 59007. doi:10.1016/j.ceramint.2025.10.119 Retrieved from: https://hdl.handle.net/20.500.14740/54970
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Abstract
In this work, (Y<inf>0.5</inf> Nd<inf>0.5</inf> Sm<inf>0.5</inf> Eu<inf>0.5</inf> Ho<inf>0.5</inf> Yb<inf>0.5</inf> )Ga<inf>5</inf> O<inf>12</inf> 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 (Y<inf>0.5</inf> Nd<inf>0.5</inf> Sm<inf>0.5</inf> Eu<inf>0.5</inf> Ho<inf>0.5</inf> Yb<inf>0.5</inf> )Ga<inf>5</inf> O<inf>12</inf> , which exhibited a low relative permittivity (ε<inf>r</inf> ) of 12.36, a negative temperature coefficient of resonant frequency (τ<inf>f</inf> ) 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.