Patent ID: 11936366
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A filter device comprising:
a piezoelectric substrate; and
a plurality of resonators including the piezoelectric substrate and interdigital transducer (IDT) electrodes, respectively; wherein
the plurality of resonators includes a first resonator and a second resonator;
the IDT electrode of the first resonator includes first and second busbars that oppose each other, and the IDT electrode of the second resonator includes third and fourth busbars that oppose each other;
the second busbar and the third busbar extend parallel or substantially parallel to each other;
a gap is present between the second busbar and the third busbar in a direction crossing lengthwise directions of at least one of the second and third busbars;
at least one of the second and third busbars is partially separated in at least one location in the direction crossing the lengthwise directions of the at least one of the second and third busbars such that an opening extends through at least a portion of the at least one of the second and third busbars;
the IDT electrode of the first resonator includes a plurality of electrode fingers that are connected to the second busbar;
the IDT electrode of the second resonator includes a plurality of electrode fingers that are connected to the third busbar; and
a number of partially separated portions in the at least one of the second and third busbars is less than a number of the plurality of electrode fingers that are connected to the corresponding second or third busbar.