(19)
(11) EP 0 518 663 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.08.1994 Bulletin 1994/34

(43) Date of publication A2:
16.12.1992 Bulletin 1992/51

(21) Application number: 92305353.2

(22) Date of filing: 11.06.1992
(51) International Patent Classification (IPC)5: H01Q 19/13, H01Q 13/02
(84) Designated Contracting States:
DE FR GB

(30) Priority: 14.06.1991 JP 169321/91

(71) Applicant: SONY CORPORATION
Tokyo (JP)

(72) Inventors:
  • Fukuzawa, Keiji
    Shinagawa-ku, Tokyo (JP)
  • Yoshida, Yoshikazu
    Shinagawa-ku, Tokyo (JP)

(74) Representative: Nicholls, Michael John 
J.A. KEMP & CO. 14, South Square Gray's Inn
London WC1R 5LX
London WC1R 5LX (GB)


(56) References cited: : 
   
       


    (54) Primary horn for parabolic-reflector antenna


    (57) 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).






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