Broadband microwave magnetic and dielectric properties of Mg0.6Cd0.4Co0.05Fe1.95O4/MgTi2O4 composites with low loss for high-frequency antennae

Impact Factor:5.2

DOI number:10.1016/j.ceramint.2020.07.294

Journal:Ceramic International

Key Words:MicrostructureMatching impedanceMagnetic and dielectric propertiesWideband and miniaturized antennas

Abstract:The microscale-driven crystal growth and structural tunability of spinel Mg ferrites (Cd0.3Mg0.7Fe2O4) were investigated using various synthesis temperatures (900, 915, 930, 945, and 960 degrees C) for their application in high-frequency antennas. The results and the crystal structure refinement and morphology analysis, indicate that an increase in the temperature led to changes in the microstructure and enhanced magnetic and dielectric properties. These properties are responsible for the matching impedance. Experimentally, an enhancement of the magnetization with increasing saturation magnetization (38-44 emu/g) and weakened coercivity (113-66 Oe) were observed. A remarkable increase (from 29 to 50) in the real permeability and a slight increase (from 21 to 26) in the permittivity were observed in a broad frequency range from the high to very high frequency bands. Higher temperature synthesis leads to a dense morphology, which enables low magnetic (tan delta(mu) similar to 10(-2)) and dielectric losses (tan delta(epsilon) similar to 10(-3)), and results in increasing grain sizes (from 0.42 to 0.92 mu m) and fewer pores. Predictably, these properties indicate the excellent applicability of these ferrites in miniaturized antennas in the frequency band of the current materials.

Indexed by:SCI

Discipline:Engineering

Document Type:J

Volume:46

Issue:18

Page Number:27996-28005

ISSN No.:0272-8842

Translation or Not:no

Included Journals:SCI

Links to published journals:https://www.sciencedirect.com/science/article/pii/S0272884220323129?via%3Dihub