(19)
(11) EP 0 383 597 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
02.01.1991 Bulletin 1991/01

(43) Date of publication A2:
22.08.1990 Bulletin 1990/34

(21) Application number: 90301627.7

(22) Date of filing: 15.02.1990
(51) International Patent Classification (IPC)5: H01Q 21/06, H01Q 21/00
(84) Designated Contracting States:
DE FR GB

(30) Priority: 15.02.1989 JP 35583/89

(71) Applicant: SHARP KABUSHIKI KAISHA
Osaka 545 (JP)

(72) Inventors:
  • Yamamoto, Hirohiko
    Tenri-shi, Nara-ken (JP)
  • Nakano, Hiroshi
    Nara-ken (JP)
  • Ohta, Tomozo
    Ikoma-shi, Nara-ken (JP)

(74) Representative: Brown, Kenneth Richard et al
R.G.C. Jenkins & Co. 26 Caxton Street
London SW1H 0RJ
London SW1H 0RJ (GB)


(56) References cited: : 
   
       


    (54) Planar antenna


    (57) A planar antenna for receiving satellite broadcasting or the like. The antenna includes a dielectric substrate (42) having a first and a second surfaces; a first conductive plate (50) arranged to face the first surface with a predetermined distance therebetween and having an arrangement of a plurality of openings (66) which allow passage of radio waves therethrough to reach the dielectric substrate (42); a second conductive plate (56) arranged to face the second surface with a predetermined distance therebetween; an arrangement of a plurality of radiating elements (36) each of which is formed on the first surface to have a smaller area than that of one of the openings (66), associated with one of the openings (66), and together with the second conductive plate (56), forming an unbalanced planar circuit resonator which resonates to the radio waves; a signal deriving network (24) formed on the first surface for deriving signals that have been induced by the radio waves in each of the radiating elements (36) to the outside; and a waveguide member (67) provided in each of the openings (66) for guiding the radio waves incident on the opening to the associated radiating element (36) and concentrating the same thereon.







    Search report