Design of a Sub-6 GHz Dielectric Resonator Antenna with Novel Temperature-Stabilized (Sm1–xBix)NbO4 (x = 0–0.15) Microwave Dielectric Ceramics

• DOI: 10.1021/acsami.1c24307
• Publication Date: 2022-01-27T17:03:30Z
• Authors: Fang-Fang Wu; Di Zhou; Chao Du; Biao-Bing Jin; Chun Li; Ze-Ming Qi; Shikuan Sun; Tao Zhou; Qiang Li; Xiu-Qun Zhang
• Keywords: Monoclinic crystal system; Temperature coefficient; Atmospheric temperature range

Microwave dielectric ceramics exhibiting a low constant (εr), high quality factor (Q × f), and thermal stability, specifically in an ultrawide temperature range (from -40 to +120 °C), have attracted much attention. In addition, the development of 5G communication has caused urgent demand for electronic devices, such as resonant antennas. Hence, feasibility optimizing properties SmNbO4 (SN) by substituting Bi3+ ions at A site was studied. The permittivity principally hinges on contribution Sm/Bi-O phonon absorption microwave range, while reduced sintering results smaller grain size slightly lower Q f value. expanded distorted crystal cell indicates that doping effectively regulates coefficient frequency (TCF) adjusting strains (causing monoclinic structure) fergusonite besides correlating with permittivity. Moreover, larger A-site radius facilitates acquisition near-zero TCF values. Notably, (Sm0.875Bi0.125)NbO4 (SB0.125N) ceramic εr ≈ 21.9, 38 300 GHz (at ∼8.0 GHz), two different values -9.0 +60 °C) -6.6 ppm/°C respectively, were obtained band. simultaneous increase phase transition (Tc) coefficients expansion (CTEs) substitution provides possibility promising barrier coating (TBC) materials. Then, cylindrical resonator antenna (CDRA) resonance 4.86 bandwidth 870 MHz fabricated SB0.125N specimen. exceptional performance shows material is possible candidate sub-6 owing advantages loss stable temperature.