Abstract
This manuscript discusses the potential of yttrium iron garnet (YIG) with various amounts of Fe2O3 excess, as a tunable dielectric resonator antenna. The exploration of YIG’s antenna microwave properties is a key to determine stability of the antenna radiation pattern and frequency shifting. YIG with various amounts of excess Fe2O3 is prepared through a mixed oxide powder technique. Through X-ray diffraction analysis, it was found that addition of 5 wt% excess Fe2O3 to YIG stoichiometric formulation has depleted YIP phases in YIG ceramics. However, increasing amount of excess Fe2O3 in excess of 15 wt% led to increase in the Fe2O3 residue in YIG ceramics. The grains observed using high resolution electron microscopy displayed a well-packed structure. The size of the grains became bigger when the percentage of Fe2O3 increased to 20 % but accompanied with significant changes in electrical properties. This change has led to a frequency shift from 14.14 to 17.32 GHz, which cover applications within the Ku-band (12.00–18.00 GHz) together with radiation stability. These results imply that inclusion of excess Fe2O3 can be used for tunable DRA.
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Acknowledgments
This work was supported by the research university team Grant (RUT) 1001/PELECT/854004 and the postgraduate research Grant scheme (PGRS) 1001/PBAHAN/8045017 from Universiti Sains Malaysia. The authors appreciate the financial support given under the MyBrain scholarship program from the Malaysian Ministry of Higher Education (Ref. No. KPT/B/870611295637), and are also grateful to Mr. Sharul Ami Zainal Abidin, and Mr Abdul Latif Hamid for their technical support.
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Ali, W.F.F.W., Othman, M., Ain, M.F. et al. The behavior of high frequency tunable dielectric resonator antenna (DRA) with the addition of excess Fe2O3 in Y3Fe5O12 (YIG) formulation. J Mater Sci: Mater Electron 25, 560–572 (2014). https://doi.org/10.1007/s10854-013-1624-1
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DOI: https://doi.org/10.1007/s10854-013-1624-1