(19)
(11) EP 0 398 419 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.01.1992 Bulletin 1992/02

(43) Date of publication A2:
22.11.1990 Bulletin 1990/47

(21) Application number: 90201164.2

(22) Date of filing: 08.05.1990
(51) International Patent Classification (IPC)5: H01P 5/18
(84) Designated Contracting States:
CH DE ES FR GB GR IT LI SE

(30) Priority: 15.05.1989 IT 2050889

(71) Applicant: SIEMENS TELECOMUNICAZIONI S.P.A.
I-20060 Cassina de Pecchi (Milano) (IT)

(72) Inventors:
  • Buoli, Carlo
    I-41030 Mirandola (Modena) (IT)
  • Palermo, Nicolangelo
    I-33100 Udine (IT)

(74) Representative: Mittler, Enrico et al
c/o Marchi & Mittler s.r.l. Viale Lombardia, 20
I-20131 Milano
I-20131 Milano (IT)


(56) References cited: : 
   
       


    (54) One-octave 90 degrees 3dB directional coupler embodied in microstrip and slotline


    (57) A 3dB 90 degrees directional coupler having a one-octave band extension for microwave circuits is described. It consists of two coupled lines (2,3) embodied in microstrip form and a slotline loop (4,5) made in the ground plane (6) of the microstrip lines.







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