Low angular-dispersion microwave absorption of a metal dual-period nondiffracting hexagonal grating
Lockyear, Matthew J.
Hibbins, Alastair P.
Sambles, J. Roy
Lawrence, Christopher R.
University of Exeter; QinetiQ Ltd, Farnborough
Applied Physics Letters
American Institute of Physics
The microwave (11.3<λ0<16.7 mm) reflectivity response of a nondiffracting dual-period hexagonal grating is explored. In three directions at 60° to each other, the aluminum grating has a repeat period of 7.2 mm in which are three equally spaced grooves, one being slightly shallower than the other two. This dual-period (λg and λg/3) structure exhibits strong microwave absorption at several different frequencies. In addition, some of the absorptions are almost completely independent of the angle of incidence and polarization of the microwave radiation.
Copyright © 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters 86 (2005) and may be found at http://link.aip.org/link/?APPLAB/86/184103/1
86 (18), article 184103