Ultrathin and lightweight microwave absorbers made of mu-near-zero metamaterials
2013 (English)In: Scientific Reports, ISSN 2045-2322, Vol. 3, 2083- p.Article in journal (Refereed) Published
We present a theory of perfect absorption in a bilayer model composed of a mu-near-zero (MNZ) metamaterial (MM) absorbing layer on a metallic substrate. Our analytical solutions reveal that a MM layer with a large purely imaginary permeability and a moderate permittivity backed by a metallic plane has a zero reflection at normal incidence when the thickness is ultrathin. The impedance-mismatched metamaterial absorber (MA) can be 77.3% thinner than conventional impedance-matched MAs with the same material loss in order to get the same absorption. A microwave absorber using double-layered spiral MMs with a thickness of only about one percent of the operating wavelength is designed and realized. An absorption efficiency above 93% at 1.74 GHz is demonstrated experimentally at illumination angles up to 60 degrees. Our absorber is 98% lighter than traditional microwave absorbers made of natural materials working at the same frequencies.
Place, publisher, year, edition, pages
Nature Publishing Group, 2013. Vol. 3, 2083- p.
Perfect Absorbers, Terahertz Regime, Surface
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-125575DOI: 10.1038/srep02083ISI: 000320983600003OAI: oai:DiVA.org:kth-125575DiVA: diva2:639944
FunderSwedish Research Council, 621-2011-4620
QC 201308122013-08-122013-08-092013-11-19Bibliographically approved