| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna for level measurement by a radar that is hard to contaminate and is easily cleaned. SOLUTION: The antenna for level gauge by the radar usable for determining the filling level of a filling matter included in a container is disclosed. The antenna comprises a reflector symmetrical about a symmetry axis and a feeder for transmitting and receiving a microwave signal between it and the reflector. The feeder has a fundamentally cylindrical and slender shape, and the longitudinal axis of the feeder fundamentally matches with the symmetry axis of the reflector. The feeder has an annular radiation supply region for transmitting electromagnetic radiation to the reflector and receiving the reflected electromagnetic radiation. In a preferable embodiment, a receiving surface ring is arranged around the feeder, at least one of the feeder and the receiving surface ring is movable from the other in the axial direction of the feeder, and thus the feeder can be easily and efficiently cleaned. A cleaning method of the antenna is also disclosed. COPYRIGHT: (C)2008,JPO&INPIT |
