Patent ID: 6426731
Filing Date: 2002-07-30
Classification: H01Q

Abstract:
Device for emitting and/or receiving electromagnetic waves comprisinga lens for focusing signals received from one direction at a point, the radiation space of the lens determining a set of directions defining a focusing surface, the lens comprising a shaped volume of dielectric material comprising a granular agglomerate defined by a homogeneous or quasi-homogeneous distribution of granules of the same type and of small size with respect to the (&lgr;R, &lgr;T) of the electromagnetic waves to be received and/or emitted by the said device, the said granules being held under pressure in the said volume by holding means shaped according to the said volume, and wherein: said volume consists of a mixture of granules and air which acts as an artificial dielectric material of equivalent permittivity &egr;equ defined according to the equation: &egr;equ+((1+2F)&egr;r0+2(1âˆ’F))/((1âˆ’F)&egr;r0+2+F), where F is the ratio of the volume effectively occupied by the granules to the total volume of the said volume (7), and &egr;r0 is the intrinsic permittivity of the granule.