(19)
(11) EP 0 357 233 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.08.1990 Bulletin 1990/35

(43) Date of publication A2:
07.03.1990 Bulletin 1990/10

(21) Application number: 89307818.8

(22) Date of filing: 01.08.1989
(51) International Patent Classification (IPC)5: H01P 3/12, H01P 11/00, H01Q 21/00
(84) Designated Contracting States:
AT BE CH DE ES FR GR IT LI LU NL SE

(30) Priority: 31.08.1988 GB 8820556

(71) Applicant: MARCONI ELECTRONIC DEVICES LIMITED
Stanmore Middlesex HA7 4LY (GB)

(72) Inventor:
  • Niman, Murray Jerel
    Chelmsford Essex CM2 8HN (GB)

(74) Representative: Cockayne, Gillian 
GEC Patent Department Waterhouse Lane
Chelmsford, Essex CM1 2QX
Chelmsford, Essex CM1 2QX (GB)


(56) References cited: : 
   
       


    (54) Waveguide apparatus


    (57) Waveguide apparatus in which a dielectric substrate 20 is placed between sections of a waveguide 24. The dielectric substrate 20 incorporates slots 21 arranged in a linear fashion and having extended portions B and C there being a narrow gap 23 between adjacent slots. This enables accurate control of radiation losses through the dielectric layer sandwiched between the sections of the waveguide to be achieved.







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