CPC H03H 9/02834 (2013.01) [H03H 9/02992 (2013.01); H03H 9/6483 (2013.01)] | 11 Claims |
1. A SAW filter device with a ladder type structure, comprising:
series resonators arranged in a series signal line;
respective shunt lines connected to respective nodes situated in the series signal line between two adjacent series resonators of the series resonators; and
parallel resonators each being arranged in a respective shunt line of the shunt lines, each of the parallel resonators comprising a first reflector, wherein:
each of the parallel resonators has a length measured in a longitudinal direction and a width measured in a transversal direction,
each of the two adjacent series resonators are connected via a common busbar extending over a length of the two adjacent series resonators,
a lateral extension of each of the common busbar forms a first section of each of the respective shunt lines,
each of the respective shunt lines comprises a broadened section that is broader than the respective common busbar, the broadened section located between the respective common busbar and a corresponding parallel resonator of the parallel resonators,
the broadened section extends over the width of the corresponding parallel resonator, and
the first reflector of each of the parallel resonators is formed at least in part from the broadened section.
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