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Materials 2016, 9(12), 1009; doi:10.3390/ma9121009

Ferrite Film Loaded Frequency Selective Metamaterials for Sub-GHz Applications

1
Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong
2
SYSU-CMU Joint Institute of Engineering, SYSU-CMU International Joint Research Institute, Foshan 528000, China
*
Author to whom correspondence should be addressed.
Academic Editors: Beatriz Noheda and Lorena Pardo
Received: 11 September 2016 / Revised: 28 November 2016 / Accepted: 29 November 2016 / Published: 13 December 2016
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Abstract

Electromagnetic metamaterials are constructed with sub-wavelength structures that exhibit particular electromagnetic properties under a certain frequency range. Because the form-factor of the substructures has to be comparable to the wavelength of the operating frequency, few papers have discussed the metamaterials under GHz frequency. In this paper, we developed an innovative method to reduce the resonant frequency of metamaterals. By integrating the meta-structures with ferrite materials of higher permeability, the cell size of the meta-structure can be scaled down. This paper describes the methodology, design, and development of low-profile GHz ferrite loaded metamaterials. A ferrite film with a permeability of 20 could reduce the resonant frequency of metamaterials by up to 50%. A prototype has been fabricated and the measurement data align well with the simulation results. Because of the lowered operational frequency, the proposed ferrite loaded metamaterials offer more flexibility for various sub-GHz microwave applications, such as cloaks, absorbers, and frequency selective surfaces. View Full-Text
Keywords: metamaterials; split ring resonators; ferrite film metamaterials; split ring resonators; ferrite film
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Gao, B.; Yuen, M.M.F.; Ye, T. Ferrite Film Loaded Frequency Selective Metamaterials for Sub-GHz Applications. Materials 2016, 9, 1009.

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