| 摘要 |
An antenna device for determining the filling level of a filling material in a container (tank) is disclosed. The antenna device comprises an essentially flat array antenna with an emitting area for emitting measuring signals towards the surface of the filling material and means for holding the array antenna over an opening of the container and to be connected to the rim of said opening in at least two points of attachment. Further, it comprises a protective dielectric cover covering said emitting area, wherein said dielectric cover has an extension larger than said opening in order to extend over the rim of said opening. The antenna device provides several advantages, such as a very efficient sealing of the container opening, a very clean solution towards the container and a very effective protection of the array antenna. In particular, the antenna device is useful in applications where resistance against contaminations are of special importance, such as in micobiological applications, and in applications where it is of importance to avoid extension of the antenna device into the container interior.
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