(19)
(11) EP 0 375 416 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.11.1990 Bulletin 1990/46

(43) Date of publication A2:
27.06.1990 Bulletin 1990/26

(21) Application number: 89313427.0

(22) Date of filing: 21.12.1989
(51) International Patent Classification (IPC)5: H01Q 9/04, H01Q 1/32
(84) Designated Contracting States:
DE ES FR GB IT SE

(30) Priority: 23.12.1988 JP 325505/88

(71) Applicant: HARADA INDUSTRY CO., LTD.
Shinagawa-ku Tokyo (JP)

(72) Inventor:
  • Harada, Takuji
    Hiratsuka-shi Kanagawa-ken (JP)

(74) Representative: Crawford, Andrew Birkby et al
A.A. THORNTON & CO. Northumberland House 303-306 High Holborn
London WC1V 7LE
London WC1V 7LE (GB)


(56) References cited: : 
   
     
    Remarks:
    The title of the invention has been amended (Guidelines for Examination in the EPO, A-III, 7.3).
     


    (54) Plane slot antenna


    (57) A plane slot antenna including a peripheral con­ducting surface (11), a central conducting surface (13) provided in the peripheral conducting surface with a space (21) in between, and a plurality of coaxial lines (20, 30). The cores (21, 31) of the coaxial lines are connected to the central conducting surface at different points thereof and outer skins (22, 32) of the coaxial lines are connected to the peripheral conducting sur­face. The antenna further includes a switch (40) pro­vided between the coaxial lines and a signal receiver so that the switch changes a connection between one of the coaxial lines and the signal receiver so that the antenna receives signal of best possible strength and phase.





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