(19)
(11) EP 0 831 548 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.04.1998 Bulletin 1998/14

(43) Date of publication A2:
25.03.1998 Bulletin 1998/13

(21) Application number: 97116385.2

(22) Date of filing: 19.09.1997
(51) International Patent Classification (IPC)6H01Q 9/04
(84) Designated Contracting States:
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

(30) Priority: 24.09.1996 JP 251555/96

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

(72) Inventors:
  • Itoh, Shigekazu
    Nagaokakyo-shi, Kyoto-fu (JP)
  • Suzuki, Nobuhiko
    Nagaokakyo-shi, Kyoto-fu (JP)

(74) Representative: Schoppe, Fritz, Dipl.-Ing. 
Schoppe & Zimmermann Patentanwälte Postfach 71 08 67
81458 München
81458 München (DE)

   


(54) Antenna


(57) A strip-line-type antenna (1) is formed of dielectric layers (11a, 11b, 11c) made of a ceramic sheet, a grounding electrode layer (12) which is disposed on the upper layer of the dielectric layer (11a) and which has nearly the same area of the dielectric layer (11a), a first radiation electrode layer (13) in the shape of nearly a square which is disposed on the upper layer of the dielectric layer (11b), a second radiation electrode layer (14) which is disposed on the upper layer of the dielectric layer (11c) and which is disposed in the shape of nearly the letter L at a position corresponding to the portion where the first radiation electrode layer (13) is not disposed, a through hole (15) for feeding formed from the rear surface of the dielectric layer (11a) to the first radiation electrode layer (13) in order to feed to the first radiation electrode layer, a plurality of through holes (16) for connecting the second radiation electrode layer to the grounding electrode layer, and capacitive coupling sections (17a, 17b) which are protrusively formed in each of the first radiation electrode layer (13) and the second radiation electrode layer (14) in order to capacitively couple the first radiation electrode layer (13) to the second radiation electrode layer (14).







Search report