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US 2018/0026605 A1Published application
Filter, multiplexer, and communication apparatus
AssigneeKYOCERA Corporation
InventorsMotoki ITO, Tomonori URATA
Life of this patent
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Abstract
An input port, an output port, and a plurality of serial resonators and a plurality of parallel resonators connected in a ladder type between the input port and the output port and including IDT electrodes are provided. The plurality of parallel resonators include at least one first parallel resonator having a resonance frequency lower than resonance frequencies of the plurality of serial resonators, and at least one second parallel resonator having a resonance frequency higher than antiresonance frequencies of the plurality of serial resonators.
Claims15
A filter comprising:
- an input port,
- an output port, and
- a plurality of serial resonators and a plurality of parallel resonators connected in a ladder type between the input port and the output port and comprising IDT electrodes, wherein
- the plurality of parallel resonators comprises
- at least one first parallel resonator having a resonance frequency lower than resonance frequencies of the plurality of serial resonators and
- at least one second parallel resonator having a resonance frequency higher than antiresonance frequencies of the plurality of serial resonators.
3 more elements
Dependencies are inferred from the claim text.