Thin resonant structures for angle and polarization independent microwave absorption
Lockyear, Matthew J.; Hibbins, Alastair P.; Sambles, J. Roy; et al.Hobson, Peter A.; Lawrence, Christopher R.
Date: 2009
Journal
Applied Physics Letters
Publisher
American Institute of Physics
Publisher DOI
Abstract
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 ...
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.
Physics and Astronomy
Faculty of Environment, Science and Economy
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