Broadband impedance-matched electromagnetic structured ferrite composite in the megahertz range
Parke, L.; Youngs, I.J.; Hibbins, Alastair P.; et al.Sambles, J. Roy
Date: 2014
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Publisher DOI
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Abstract
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 ...
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.
Physics and Astronomy
Faculty of Environment, Science and Economy
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