Microwave filter with coupling elements

(19)

(11)

EP 0 871 235 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	24.03.1999 Bulletin 1999/12

(43)	Date of publication A2:
	14.10.1998 Bulletin 1998/42

(21)	Application number: 98400865.6

(22)	Date of filing: 09.04.1998

(51)	International Patent Classification (IPC)⁶: H01P 1/208

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

11.04.1997 ES 9700777

(71)	Applicant: ALCATEL ALSTHOM COMPAGNIE GENERALE D'ELECTRICITE
	75008 Paris (FR)

(72)	Inventors:
	Caceres Armendariz, José Luis 28760 Tres Cantos (Madrid) (ES) Shamsaifar, Khosro 28043 Madrid (ES) Delgado Cabello, Silvia 28009 Madrid (ES)

(74)	Representative: Feray, Valérie et al
	Compagnie Financière Alcatel, DPI, 30, avenue Kléber 75116 Paris 75116 Paris (FR)

(54)	Microwave filter with coupling elements

(57) A microwave filter with multiple resonant cavities that are delimited by conducting walls and arranged consecutively. Two adjacent walls are coupled by means of a coupling element comprising a first opening in the common wall of said cavities, a probe (23) positioned in said first opening, which produces a coupling of opposite sign to that defined by said first opening and, also, includes movable adjustment means (33) which penetrate the first opening and whose function is to adjust the overall value of the coupling produced by the combination of said first opening and said probe (23). Consequently, a progressive adjustment of the overall value of the coupling is obtained in a wide range of values.

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