Design and fabrication of a satellite communication dielectric resonator antenna with novel low loss and temperature-stabilized (Sm1–xCax) (Nb1–xMox)O₄ (x = 0.15–0.7) microwave ceramics
|Author:||Wu, Fangfang1,2; Zhou, Di3; Du, Chao3;|
1Key Laboratory of Multifunctional Materials and Structures, Ministry of Education, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China;
2Microelectronics Research Unit, University of Oulu, Oulu FI-90014, Finland
3Key Laboratory of Multifunctional Materials and Structures, Ministry of Education, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
4State Key Laboratory for Mechanical Behaviour of Materials, Xi’an Jiaotong University, Xi’an 710049, P. R. China
5Physics Department, Faculty of Science, Tanta University, Tanta 31527, Egypt
6School of Electronic and Information Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
|Online Access:||PDF Full Text (PDF, 13.2 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe20231108143550
American Chemical Society,
|Publish Date:|| 2023-11-08
Phase transition–structure–dielectric properties in microwave band correlations were determined for the (Sm1–xCax) (Nb1–xMox)O₄ (SNCMo@x) system. X-ray and Raman analyses along with selected-area electron diffraction indicated that SNCMo@x (0.15 ≤ x < 0.375) ceramics crystallize in the I2/a space group (monoclinic fergusonite), whereas the I4₁/a space group (tetragonal scheelite) best describes SNCMo@x (0.375 ≤ x ≤ 0.7), suggesting that the increased ionic radius of the A-site effectively contributed to the ferroelastic phase transition and ensures the stability of the scheelite phase. The SNCMo@x ceramic materials exhibit composition-dependent permittivity (εr) with a distribution between 12.0 and 17.7. The distortion and deformation of the [BO] polyhedra should be responsible for the shift from negative to positive temperature coefficient of resonant frequency (TCF) and the irregular behavior of the quality factor (Q × f). An optimum microwave dielectric performance was achieved for SNCMo@0.18 (εr ∼ 17.1, Q × f ∼ 52, 800 GHz at ∼8.80 GHz, and TCF ∼ −1.4 ppm/°C). This work demonstrates the important role of simultaneous substitution of A/B cations on [BO] polyhedral distortion and deformation in RENbO₄ materials and its significant effect on the microwave dielectric properties. Also, the SNCMo@0.18 ceramic has been designed as a cylindrical dielectric resonator antenna with a high simulated radiation efficiency (97.1%) and gain (5.96 dBi) at the center frequency (7.75 GHz), indicating its promising application in X-band satellite communication (7.62–7.89 GHz) because of its adjustable permittivity, low loss, and good temperature stability.
Chemistry of materials
|Pages:||104 - 115|
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
213 Electronic, automation and communications engineering, electronics
216 Materials engineering
116 Chemical sciences
This work was supported by the National Natural Science Foundation of China (52072295 and 62175056), the International Cooperation Project of Shaanxi Province (2021KWZ-10), the Zhejiang Provincial Science and Technology Program under grant LGG20F010007, the Fundamental Research Funds for the Central University, and the 111 Project of China (B14040).
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