......DE....FRGB..................................J0518663EUROPEAN PATENT APPLICATIONA319940824EP92305353.219920611enenen169321/9119910614JP19940824199434199212161992515 5H 01Q 19/13 A 5H 01Q 13/02 BdeHornstrahler für ParabolantenneenPrimary horn for parabolic-reflector antennafrSource primaire du type cornet pour antenne parabolique3SONY CORPORATION00214022N.65084-MN/SLS7-35, Kitashinagawa 6-chome Shinagawa-kuTokyoJPFukuzawa, Keijic/o Sony Corporation, 7-35 Kitashinagawa 6-chomeShinagawa-ku, TokyoJPYoshida, Yoshikazuc/o Sony Corporation, 7-35 Kitashinagawa 6-chomeShinagawa-ku, TokyoJPNicholls, Michael John00061941J.A. KEMP & CO. 14, South Square Gray's InnLondon WC1R 5LXGBDEFRGB19940824199434

A parabolic-reflector antenna has a primary horn (13) including first (21), second (22), and third (23) hollow portions. The first hollow portion (21) has an elliptical aperture on one end thereof and a circular cross section on an opposite end thereof, and is progressively tapered away from the elliptical aperture. The second hollow portion (22) has a circular cross section and a constant diameter, and is joined to the opposite end of the first hollow portion (21). The third hollow portion (23) has a circular cross section on one end thereof and a circular cross section on an opposite end thereof. The third hollow portion (23) is joined to the second hollow portion (22), and is progressively tapered away from the second hollow portion (22). The parabolic-reflector antenna also includes a parabolic reflector (12) having an elliptical aperture whose major axis is perpendicular to the major axis of the elliptical aperture of the primary horn (13).