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

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.
Authors:
; ;  [1] ;  [2]
  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)
Publication Date:
OSTI Identifier:
22300102
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTENNAS; FERRITES; IMPEDANCE; MHZ RANGE; PERMEABILITY; PERMITTIVITY; POLARIZATION; REFLECTION; REFRACTIVE INDEX; SYMMETRY; TRANSMISSION