(19)
(11) EP 0 580 193 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
06.07.1994 Bulletin 1994/27

(43) Date of publication A2:
26.01.1994 Bulletin 1994/04

(21) Application number: 93201469.9

(22) Date of filing: 24.05.1993
(51) International Patent Classification (IPC)5: H01P 7/06
(84) Designated Contracting States:
BE DE ES FR GB NL SE

(30) Priority: 05.06.1992 IT MI921400

(71) Applicant: FOR.E.M. S.p.A.
I-20041 Agrate Brianza (Milano) (IT)

(72) Inventors:
  • Bandera, Mario
    I-20040 Carnate (IT)
  • Tansini, Vittorio
    I-20153 Milano (IT)
  • Sala, Antonio
    I-20041 Agrate Brianza (IT)

(74) Representative: Incollingo, Italo 
Piazzale Lavater, 3
I-20129 Milano
I-20129 Milano (IT)


(56) References cited: : 
   
       


    (54) Thermal compensation of wave guide resonant cavities


    (57) In a wave guide resonant cavity (CAR) formed of f.i. six walls, at least one of which (PE (2)) carries input and output connectors (CON. I, CON.U) and coupling loops (LO), a variable capacity (Cv) is created by displacement of a nucleus or wedge (Cu) on a rodshaped support (AS) which extends along the cavity whole major axis and is free to expand at one end (PE (1)). The maximum value of capacity (Cv) is reached at the maximum displacement of the wedge (Cu) towards said wall (PE(2)) carrying connectors and loops.






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