Filter with multiple shunt zeros

Details Filter with multiple shunt zeros Filter with multiple shunt zeros

H - Electricity

01

P

H01P 1/205 (2006.01)

Patent

CA 2609724

A filter including at least two resonator through-holes defining apertures in the top surface surrounded by respective plates which in combination with associated through-holes define primary and secondary shunt zeros providing low ripple and high rejection adjacent the bandpass. In one embodiment, the through-hole of the primary shunt zero is coupled directly to an input/output pad, while the through-hole of the secondary shunt zero is indirectly coupled to the input/output pad via a coupling bar extending between the input/output pad and the secondary shunt zero. In another embodiment, the secondary shunt zero may be coupled directly to the input/output pad. In a further embodiment, additional resonator through-holes in combination with associated plates define additional shunt zeros coupled directly or indirectly to the input/output pad.

Un filtre comprenant au moins deux orifices passants résonants délimitant des ouvertures dans la surface supérieure entourée de plaques respectives qui, combinées à des orifices passants associés, délimitent des zéros de shunt principaux et secondaires entraînant une faible fluctuation et un fort rejet au contact de la bande passante. Dans un mode de réalisation, l'orifice passant du zéro de shunt principal est couplé directement à un plot d'entrée/sortie, alors que l'orifice passant du zéro de shunt secondaire est indirectement couplé au plot d'entrée/sortie via une barre de couplage s'étendant entre le plot d'entrée/sortie et le zéro de shunt secondaire. Dans un autre mode de réalisation, le zéro de shunt secondaire peut être directement couplé au plot d'entrée/sortie. Dans un mode de réalisation différent, des orifices passants résonants supplémentaires combinés à des plaques associées délimitent des zéros de shunt supplémentaires couplés directement ou indirectement au plot d'entrée/sortie.

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