(19)
(11) EP 0 235 846 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.09.1988 Bulletin 1988/37

(43) Date of publication A2:
09.09.1987 Bulletin 1987/37

(21) Application number: 87200231

(22) Date of filing: 13.02.1987
(84) Designated Contracting States:
BE DE ES FR GB GR IT NL

(30) Priority: 03.03.1986 IT 1960886

(71) Applicant: SIEMENS TELECOMUNICAZIONI S.P.A.
 ()

(72) Inventors:
  • Bonato, Paolo
     ()
  • Giavarini, Andrea
     ()

   


(54) Dual polarization microwave receiver for direct reception from a broadcasting satellite


(57) The receiver combines a feed, a polarizer and a decoupler of the orthogonal modes in a single wave-guide structure (1) with the internal cross section increasing toward the ends. The minimum and maximum dimensions of the cross sections are selected in such a manner as to describe a middle cutoff frequency of the guided structure (1) greater than the local oscillation frequency and the image band frequencies and smaller than the signal radio frequencies. Two RF-IF converters (2,3) are associated with said structure (1).







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