Patent ID: 6897820
Filing Date: 2005-05-24
Classification: H01Q

Abstract:
1. A device configured to be substantially transparent to electromagnetic radiation of a certain frequency band defined by two frequencies F 1 and F 2 of the maximal transparency of the device, the device comprising at least one dielectric structure of a predetermined thickness loaded with inclusions forming a predetermined substantially periodic pattern inside said at least one dielectric structure, wherein a value of said predetermined thickness is defined by a central frequency between said frequencies F 1 and F 2 and is such that said at least one dielectric structure in its unloaded state has minimal transparency for said central frequency, and the inner pattern is formed by a two-dimensional array of spaced-apart substantially identical sub-resonant capacitive elements, which are disconnected from each other and are made of an electrically conducting material capable of scattering the electromagnetic radiation, said capacitive elements having a geometry and size and being spaced from one another in an array such that the device is tuned to be substantially transparent to said frequencies F 1 and F 2 .