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US 12,289,101 B2Granted
Duplexer
AssigneeSanan Japan Technology Corporation
InventorYuki Koto
Life of this patent
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Abstract
A duplexer includes a piezoelectric substrate, a receiving filter formed on the piezoelectric substrate, the receiving filter includes a plurality of resonators, and a transmitting filter formed on the piezoelectric substrate, the transmitting filter includes a plurality of resonators. One of the resonators of the receiving filter is a multi-mode type acoustic wave resonator having a capacitance that is two times or more the average capacitance of the other resonators formed on the piezoelectric substrate.
Claims10
A duplexer, comprising:
- a piezoelectric substrate;
- a receiving filter formed on the piezoelectric substrate, the receiving filter includes a first plurality of resonators;
- and
- a transmitting filter formed on the piezoelectric substrate, the transmitting filter includes a second plurality of resonators;
- wherein one of the first plurality of resonators of the receiving filter is a multi-mode type acoustic wave resonator having a capacitance that is two times or more an average capacitance of other ones of the first plurality of resonators and the second plurality of resonators formed on the piezoelectric substrate, and
- wherein the multi-mode type acoustic wave resonator includes a first IDT electrode, a second IDT electrode, a third IDT electrode, a fourth IDT electrode and a fifth IDT electrode adjacently formed in this order, and a number of electrode fingers of the third IDT electrode is more than a sum of numbers of electrode fingers of the first IDT electrode, the second IDT electrode, the fourth IDT electrode, and the fifth IDT electrode.
3 more elements
Dependencies are inferred from the claim text.