Surface acoustic wave resonator, surface acoustic wave filter, and duplexer
AssigneeMurata Manufacturing Co., Ltd.
InventorToru EIHAMA
Life of this patent
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Abstract
A surface acoustic wave resonator includes first and second surface acoustic wave resonator connected in series, and a third surface acoustic wave resonator connected in series with the second surface acoustic wave resonator. Each of the first to third surface acoustic wave resonators includes a pair of comb-shaped electrodes in which electrode fingers of one of the comb-shaped electrodes and electrode fingers of the other one of the comb-shaped electrodes are alternately arranged. The second surface acoustic wave resonator has a lower ratio of a width of the electrode fingers to a pitch between the electrode fingers than the first and third surface acoustic wave resonators.
Claims18
A surface acoustic wave resonator comprising:
- a first surface acoustic wave resonator;
- a second surface acoustic wave resonator connected in series with the first surface acoustic wave resonator;
- and
- a third surface acoustic wave resonator connected in series with the second surface acoustic wave resonator;
- wherein
- each of the first, second and third surface acoustic wave resonators includes a pair of comb-shaped electrodes in which a plurality of electrode fingers of one of the comb-shaped electrodes and a plurality of electrode fringes of the other one of the comb-shaped electrodes are alternately arranged along an acoustic wave propagation direction;
- and
- the second surface acoustic wave resonator has a lower ratio of a width of the electrode fingers to a pitch between the electrode fingers than the first and third surface acoustic wave resonators.
Dependencies are inferred from the claim text.