Communications: radio wave antennas – Antennas – With means for moving directive antenna for scanning,...
Reexamination Certificate
2003-12-16
2008-12-23
Dinh, Trinh V (Department: 2821)
Communications: radio wave antennas
Antennas
With means for moving directive antenna for scanning,...
Reexamination Certificate
active
07468706
ABSTRACT:
An antenna system and method for measuring azimuth and elevation angles of an active, signal sending radiosonde. The system includes a first passive antenna group having at least two antenna arrays, the direction pattern of which is wide at least in elevation plane for measuring azimuth angle based on the phase differences between the antenna arrays, a second passive antenna group having at least two antenna arrays, the direction pattern of which is wide at least in elevation plane for measuring the elevation angle based on the phase differences between the antenna arrays and the rotational position of the antenna field, and at least one third antenna having high gain for receiving the telemetry signal, the direction pattern of which element is narrow in azimuth plane and wide in elevation plane. The first and second antenna groups form a solid antenna field which is fixedly tilted in a predetermined elevation position.
REFERENCES:
patent: 5053784 (1991-10-01), Hippeläinen
patent: 5245348 (1993-09-01), Nishikawa et al.
patent: 5486835 (1996-01-01), Hock
patent: 5543811 (1996-08-01), Chethik
patent: RU 2 195 056 (2002-12-01), None
Yingbo Hua et al., IEEE Transactions on Antennas and Propagation, vol. 39, No. 2 Feb. 1991, pp. 143-146.
Andersson Henry
Jaatinen Juhana
Karhunen Pentti
Korte Jarkko
Birch & Stewart Kolasch & Birch, LLP
Dinh Trinh V
Duong Dieu Hien T
Vaisala OYJ
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