Patent ID: 6844798
Filing Date: 2005-01-18
Classification: H01P

Abstract:
1. A device for transmitting electromagnetic waves, for a given characteristic frequency, comprising: a first layer of dielectric material, the thickness of the first layer being substantially equal to odd multiple of half of the effective wavelength of the electromagnetic waves at the characteristic frequency in the dielectric material of the first layer, a second layer of dielectric material spaced apart by a distance from the first layer of dielectric material, the thickness of the second layer being substantially equal to an odd multiple of half of the effective wavelength of the electromagnetic waves at the characteristic frequency in the dielectric material of the second layer, the distance being substantially equal to an odd multiple of quarter wavelength of the electromagnetic waves at the characteristic frequency within a space between the first layer and the second layer, and a sleeve having an electrically conductive coating on the internal surface thereof, the sleeve being positioned adjacent to the second layer opposite from the first layer.