Biconical multimode resonator

H - Electricity – 01 – P

Patent

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H01P 7/06 (2006.01)

Patent

CA 2134386

A bandpass microwave filter (32) is constructed by use of a right cylindrical cavity resonator (10) wherein end regions (22, 24) of the resonator are tapered. The tapering is accomplished by replacing end portions of a right cylindrical sidewall with frusto-conic sections (22, 24) of side wall. Each frusto-conic section joins a central cylindrical section (26) of the sidewall with a planar end wall (14, 16). Each of the end walls is provided with a coupling slot (28, 30) having dimensions substantially smaller than a half wavelength of the center resonant frequency of the resonator so as to be a nonresonant slot. The slots in the end walls may be coupled to rectangular waveguides (34, 36) which form input and output ports by which electromagnetic signals are applied to and extracted from the resonator.

Un filtre hyperfréquence passe-bande (32) est construit à l'aide d'un résonateur à cavité cylindrique droite (10) dont les régions terminales (22, 24) sont effilées. L'effilement est réalisé par substitution des sections frusto-coniques (22, 24) de la paroi latérale aux parties terminales d'une paroi latérale cylindrique droite. Chaque section frusto-conique réunit une section cylindrique centrale (26) de la paroi latérale à une paroi terminale planaire (14, 16). Chacune des parois terminales est dotée d'une fente de couplage (28, 30) de taille sensiblement inférieure à une demi-longueur d'onde de la fréquence résonante centrale du résonateur, ce qui en fait une fente non résonante. Les fentes des parois terminales peuvent être couplées à des guides d'ondes rectangulaires (34, 36) qui constituent des ports d'entrée et de sortie par lesquels des signaux électromagnétiques sont appliqués au résonateur et en sont extraits.

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