Arrangement comprising a dms filter and a steep right edge
AssigneeSnapTrack, Inc.
InventorAndreas BERGMANN
Life of this patent
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Abstract
In an arrangement having a DMS filter, it is provided to symmetrically divide at least one of the transducers (W) of the DMS filter (DMS) into two sub-transducers (T,T′) electrically connected in parallel and to shift them apart from each other by an amount of at least a half wavelength. This results in the signals of the two sub-transducers canceling each other out at a frequency in a stopband and thereby generating an attenuation pole in the upper blocking region.
Claims13
An arrangement comprising a DMS filter,
- wherein the DMS filter (DMS) has first and second converters (W1, W2) that are arranged alternately on a piezoelectric substrate between two reflectors (R1, R2) and are each connected to an input or output of the arrangement
- wherein at least one of the transducers (W1, W2) is symmetrically divided into two sub-transducers electrically connected in parallel,
- wherein the sub-transducers are shifted apart from each other by an amount of approximately one half wavelength with respect to their original position in such a way that their signals cancel each other out at a frequency in a stopband.
The arrangement according to one of the preceding claims, wherein all first transducers are connected in parallel.
The arrangement according to one of the preceding claims, wherein all second transducers are connected in parallel.
The arrangement according to one of the preceding claims, wherein the transducers of at least one type selected from first and second transducer are connected to a symmetrical gate.
Dependencies are inferred from the claim text.