Communications: directive radio wave systems and devices (e.g. – Determining distance – Material level within container
Reexamination Certificate
2005-02-22
2005-02-22
Tarcza, Thomas H. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Material level within container
C342S175000, C073S29000R
Reexamination Certificate
active
06859166
ABSTRACT:
An antenna device in a radar-based level gauge mounted at an opening in a roof of a tank, the antenna device comprising at least one elongated radiating structure, which has a length that is substantially larger, preferably more than 3-5 times longer, than a maximum cross-sectional length dimension of the opening; is oriented in a non-vertical position; and is configured and fed to produce an essentially vertical radiation beam directed downwards in the tank. Preferably, the antenna device is foldable and is inserted into the tank through the opening and oriented in the non-vertical position by means of folding the radiating structure.
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Antenna Engineering Handbook, by R. Johnson, Third Edition; McGraw-Hill 1993, pgs. 10-1-10-59 and 9-1-9-39.
Alsomiri Isam
Saab Marine Electronics AB
Tarcza Thomas H.
Westman Champlin & Kelly P.A.
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