CPC H03H 9/02228 (2013.01) [H03H 9/02015 (2013.01); H03H 9/0211 (2013.01); H03H 9/54 (2013.01)] | 19 Claims |
1. A longitudinally coupled resonator acoustic wave filter, comprising:
a piezoelectric substrate;
a plurality of IDT electrodes on the piezoelectric substrate and arranged along an acoustic wave propagation direction; and
a pair of reflectors on the piezoelectric substrate on both sides of the plurality of IDT electrodes in the acoustic wave propagation direction; wherein
each of the pair of reflectors includes a first reflector busbar and a second reflector busbar facing each other and a plurality of reflective electrode fingers connected to at least one of the first reflector busbar and the second reflector busbar;
each of the pair of reflectors includes a first portion in which lengths of the plurality of reflective electrode fingers change in the acoustic wave propagation direction; and
the plurality of reflective electrode fingers of each of the pair of reflectors include a first reflective electrode finger including one end connected to the first reflector busbar and another end connected to the second reflector busbar, and a second reflective electrode finger including one end connected to the first reflector busbar and another end facing the second reflector busbar with a gap therebetween.
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