(19)
(11) EP 0 433 092 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.11.1991 Bulletin 1991/46

(43) Date of publication A2:
19.06.1991 Bulletin 1991/25

(21) Application number: 90313700.8

(22) Date of filing: 14.12.1990
(51) International Patent Classification (IPC)5: H01Q 21/24, H01P 1/161, H01P 1/175
(84) Designated Contracting States:
DE FR GB

(30) Priority: 14.12.1989 JP 324228/89

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

(72) Inventors:
  • Enokuma, Shunji
    Osaka-Sayama-shi, Osaka (JP)
  • Osabe, Yasuo
    Amagasaki-shi, Hyogo (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) Polarization converter having two converting devices therein


    (57) Disclosed is a polarization converter (9) allowing one down converter to receive four types of polarizations of a horizontal polarization, a vertical polarization, a right-handed circular polarization and a left-handed circular polarization without deteriorating a pass loss characteristic and a return loss characteristic (VSWR characteristic) of an antenna apparatus as a whole. The polarization converter (9) includes a circular waveguide (20) having dielectric plate (8) for converting a circular polarization to a linear polarization, a ferrite pole (10) for changing the direction of the electric field of the linear polarization and a coil (11), all of which are integrally provided therein. As a result, the design is easily obtained which optimizes the return loss characteristic (VSWR characteristic) of the entire antenna apparatus, which allows one converter to receive said four types of polarizations without deteriorating the pass loss characteristic and the return loss characteristic (VSWR characteristic) of the entire antenna apparatus.






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