Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

2005-09-06

2005-09-06

Takaoka, Dean (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000

Reexamination Certificate

active

06940368

ABSTRACT:
The invention relates to a surface acoustic wave filter (or SAW filter) comprising a symmetrical network with differential inputs/outputs, in particular for mobile telecommunication systems. A network of the ladder or balanced bridge type comprises at least one structure of the surface acoustic wave resonator type, that comprises at least two transducers in the same acoustic channel, two of said transducers being substantially identical, connected to two symmetrical branches of the network and arranged in such a way that the acoustic waves generated by the two transducers are in phase. Advantageously, arrays of reflectors are placed on either side of the structure. Apart from saving space, this structure makes it possible in particular to simplify the production of the filter and to achieve better control in balancing the branches.

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