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 (tanδε ~ 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.
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