We present a study of the dielectric properties and behaviour of dielectric resonator antennas (DRAs) based on SrBi2Nb2O9 (SBN)-Bi2O3 composites. X-ray diffraction is used for structural characterisation of the samples and it indicates the formation of a new phase after the addition of Bi2O3. The temperature coefficient of resonant frequency (τ f) is measured and the results demonstrate that the increment of Bi2O3 improves the thermal stability of the composites from −345.62 to −235.02 ppm/°C. For the dielectric properties, it is observed that Bi2O3 additions cause the formation of new phases, which present higher dielectric ϵ’ than SBN. Our numerical simulations show that the materials operate as DRAs and that SBN-Bi2O3 composites could be potential candidates for DRAs operating in the S band.

中文翻译：

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用于微波范围的 SrBi2Nb2O9-Bi2O3 复合材料的介电特性和数值研究

我们研究了基于 SrBi2Nb2O9 (SBN)-Bi2O3 复合材料的介电谐振器天线 (DRA) 的介电特性和行为。X 射线衍射用于样品的结构表征，它表明添加 Bi2O3 后形成了新相。测量谐振频率的温度系数 (τ f)，结果表明 Bi2O3 的增加将复合材料的热稳定性从 -345.62 提高到 -235.02 ppm/°C。对于介电特性，观察到添加 Bi2O3 会导致新相的形成，其介电常数 ϵ' 高于 SBN。我们的数值模拟表明，这些材料作为 DRA 工作，SBN-Bi2O3 复合材料可能是在 S 波段工作的 DRA 的潜在候选材料。