Multi-passband dielectric filter construction

H - Electricity – 01 – P

Patent

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Details

H01P 1/203 (2006.01) H01P 1/205 (2006.01) H01P 7/10 (2006.01) H03H 9/24 (2006.01) H03H 9/46 (2006.01)

Patent

CA 2114029

A filter duplexer (280), such as a filter duplexer for a radio transceiver, of minimum dimensions is disclosed. A first filter portion (304, 308, 312, 316) of the duplexer filter includes resonators of at least a first geometric configuration, and a second filter circuit portion (320, 324, 328, 332, 336) of the duplexer filter comprises resonators of a second geometric configuration. The geometric configuration of the two filter circuit portions are dissimilar, and the relative characteristic admittances of the resonators of the respective filter circuit portions are dissimilar. Because the resonators of the two filter circuit portions are of dissimilar electrical characteristics, a desired frequency response of the duplexer filter may be obtained with similar loading capacitances.

L'invention est un filtre de duplexeur (280) d'encombrement minimum du genre filtre pour émetteur-récepteur radio. Ce filtre est constitué d'un premier bloc de filtrage (304, 308, 312, 316) comportant des résonateurs d'au moins une première configuration géométrique, et un second bloc de filtrage (320, 324, 328, 332, 336) comportant des résonateurs d'une seconde configuration géométrique. Ces deux blocs de filtrage ont des configurations géométriques différentes et de même, les admittances caractéristiques relatives des résonateurs des blocs de filtrage respectifs sont différentes. Étant donné que les résonateurs des deux blocs de filtrage ont des caractéristiques électriques différentes, on peut obtenir la réponse en fréquence désirée avec le filtre en utilisant des capacités de charge identiques.

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