Ga-substituted Mg-Cd ceramic composites for improving the miniaturization and wideband characteristics of high-frequency antennas. Issue 10 (July 2020)

• Record Type: Journal Article
• Authors: Gan, Gongwen; Zhang, Dainan; Li, Jie; Wang, Gang; Huang, Xin; Rao, Yiheng; Yang, Yan; Wang, Xueying; Zhang, Huaiwu; Chen, Ray T.
• Is Part Of: Ceramics international. Volume 46:Issue 10(2020)Part B
• Page Start: 16901
• Page End: 16907
• Publication Date: 2020-07
• Subjects: Ga substitution -- Mg-Cd ceramic Composites -- High frequency -- Miniaturization -- Wideband antennas; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.03.269
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Mg0·8 Cd0·2 Fe1.9 Ga0.1 O4 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 μ m. Elevated saturation magnetization ( M s ≈ 26 emu/g) and reduced coercivity ( H c ≈ 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 (tan δ μ ~10 −2 ) and dielectric (tan δ ε ~ 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.