Broadband impedance-matched electromagnetic structured ferrite composite in the megahertz range

Journal Article · Mon Jun 02 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4881186· OSTI ID:22300102

Parke, L.; Hibbins, A. P.; Sambles, J. R. ^[1]; Youngs, I. J. ^[2]

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1. Electromagnetic and Acoustic Materials Group, Department of Physics and Astronomy, University of Exeter, Stocker Road, Exeter, Devon EX4 4QL (United Kingdom)
2. DSTL, Salisbury, Wiltshire SP4 0JQ (United Kingdom)

A high refractive-index structured ferrite composite is designed to experimentally demonstrate broadband impedance matching to free-space. It consists of an array of ferrite cubes that are anisotropically spaced, thereby allowing for independent control of the effective complex permeability and permittivity. Despite having a refractive index of 9.5, the array gives less than 1% reflection and over 90% transmission of normally incident radiation up to 70 MHz for one of the orthogonal linear polarisations lying in a symmetry plane of the array. This result presents a route to the design of MHz-frequency ferrite composites with bespoke electromagnetic parameters for antenna miniaturisation.

• OSTI ID: 22300102
• Journal Information: Applied Physics Letters, Vol. 104, Issue 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTENNAS
FERRITES
IMPEDANCE
MHZ RANGE
PERMEABILITY
PERMITTIVITY
POLARIZATION
REFLECTION
REFRACTIVE INDEX
SYMMETRY
TRANSMISSION