(19)
(11) EP 0 312 011 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.04.1990 Bulletin 1990/17

(43) Date of publication A2:
19.04.1989 Bulletin 1989/16

(21) Application number: 88116936.1

(22) Date of filing: 12.10.1988
(51) International Patent Classification (IPC)4: H01P 1/205
(84) Designated Contracting States:
DE FR SE

(30) Priority: 15.10.1987 JP 261072/87

(71) Applicant: MURATA MANUFACTURING CO., LTD.
Nagaokakyo-shi Kyoto-fu 226 (JP)

(72) Inventor:
  • Yorita, Tadahiro
    Kanazawa-shi Ishikawa-ken (JP)

(74) Representative: Glawe, Delfs, Moll & Partner 
Patentanwälte Postfach 26 01 62
80058 München
80058 München (DE)


(56) References cited: : 
   
       


    (54) Dielectric filter


    (57) A dielectric filter (1A) which functions as a band elimination filter for attenuating only a signal of a particular frequency region, and includes a dielectric block (2) formed with a plurality of through-bores (3) in it in a parallel relation to each other, inner-conductor layers (4) respectively formed within the through-bores, an outer-conductor layer (5) formed at least on an outer side face (2b) of the dielectric block, so as to constitute a plurality of resonators (7), coupling members (9) respectively disposed within the through-bores for capacitive coupling with the inner conductor layers, and a concentrated constant line (10) respectively connecting neighboring ones of the coupling members.







    Search report