Importance

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Abstract

Absorber elements for reducing electromagnetic leakage radiation, in particular in the vicinity of horn antennas, are in the form of ribs with a roof- or wedge-shaped cross section arranged such that the angle enclosed by lateral surfaces of the absorber elements is less than 90.degree., so that at least the leakage radiation impinging in general parallel to the center plane of the absorber elements arrives at a large angle of incidence, i.e. glancingly. In particular, if the angle of incidence approximately corresponds to the Brewster angle, the result is an almost complete absorption of the corresponding polarization components of the leakage radiation. The absorption effect can be further optimized by proper selection of the configuration of the roof- or wedge-shaped absorber elements. A preferred use of these absorber elements is in connection with transmission measurement for the determination of moisture, for example, employing opposed horn antennas between which a layer of material to be measured is passed. The absorber elements are then disposed in the vicinity of the receiving horn antenna, because of which they display satisfactory absorption effects. Because of their wedge-shaped design, the absorber elements remain free of dirt accumulation to a large degree, since material to be measured which might fall down cannot stick to the lateral surfaces of the absorber elements.

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First Claim