Thin resonant structures for angle and polarization independent microwave absorption

We present a microwave absorbing structure comprised of an array of subwavelength radius copper disks, closely spaced from a ground plane by a low loss dielectric. Experiments and accompanying modeling demonstrate that this structure supports electromagnetic standing wave resonances associated with...

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Published in:Applied physics letters 2009-01, Vol.94 (4)
Main Authors: Lockyear, Matthew J., Hibbins, Alastair P., Sambles, J. Roy, Hobson, Peter A., Lawrence, Christopher R.
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Language:English
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container_title Applied physics letters
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creator Lockyear, Matthew J.
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description We present a microwave absorbing structure comprised of an array of subwavelength radius copper disks, closely spaced from a ground plane by a low loss dielectric. Experiments and accompanying modeling demonstrate that this structure supports electromagnetic standing wave resonances associated with a cylindrical cavity formed by the volume immediately beneath each metal disk. Microwave absorption on resonance of these modes, at wavelengths much greater than the thickness of the structure, is dictated almost entirely by the radius of the disk and permittivity of the dielectric, being largely independent of the incident angle and polarization.
doi_str_mv 10.1063/1.3059568
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title Thin resonant structures for angle and polarization independent microwave absorption
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