Abstract Mg0·8Cd0·2Fe1.9Ga0.1O4 ceramic ferrites were synthesized using a solid-state reaction method at 900, 915, 930 and 945 °C. Crystallization analysis indicated that the change in temperature resulted in obvious changes in the microstructure. SEM images indicated that the grain size increased from 0.8 to 1.8 μm. Elevated saturation magnetization (Ms ≈ 26 emu/g) and reduced coercivity (Hc ≈ 53 Oe) indicated the excellent soft-magnetic behavior of the ceramics. The real part of the permeability correspondingly increased (29–51), and the real part of permittivity showed a slight fluctuation (20–25) with an increase in the temperature. Consequently, an upward bandwidth ratio (BWR ≈ 0.2, 915 °C) and matching characteristic impedance were obtained over a wide frequency range of 1–100 MHz. Additionally, with the low magnetic (tanδμ ~10−2) and dielectric (tanδe ~ 10−4-10−3) tangent values, the proposed materials can act as potential agents for enhancing the bandwidth and miniaturization of antennas operating at high frequencies.

中文翻译：

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Ga取代Mg-Cd陶瓷复合材料改善高频天线的小型化和宽带特性

摘要 采用固相反应法在900、915、930和945 ℃下合成了Mg0·8Cd0·2Fe1.9Ga0.1O4陶瓷铁氧体。结晶分析表明，温度的变化导致显微组织的明显变化。SEM 图像表明晶粒尺寸从 0.8 增加到 1.8 微米。升高的饱和磁化强度 (Ms ≈ 26 emu/g) 和降低的矫顽力 (Hc ≈ 53 Oe) 表明陶瓷具有优异的软磁性能。渗透率实部相应增加（29-51），介电常数实部随着温度的升高呈现轻微波动（20-25）。因此，在 1–100 MHz 的宽频率范围内获得了向上的带宽比 (BWR ≈ 0.2, 915 °C) 和匹配特性阻抗。此外，