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US 8,026,776 B2Granted
Acoustic wave device, duplexer, communication module, and communication apparatus
AssigneeTaiyo Yuden Co., Ltd.
InventorsMasanori Ueda, Motoaki Hara, Shogo Inoue, Kenya Hashimoto, Yasutomo Tanaka, Masatsune Yamaguchi, Tatsuya Omori
Life of this patent
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Abstract
An acoustic wave device includes a ladder-type filter in which resonators are connected in a ladder configuration. In the acoustic wave device, series-connected resonators are connected in a parallel line in the ladder-type filter, and the resonators connected in the parallel line have mutually different resonance frequencies.
Claims11
An acoustic wave device, comprising
- a ladder-type filter in which a plurality of resonators are series-connected in a parallel line, and include a compensating resonator having a resonance frequency that is higher than a resonance frequency of another resonator connected in the parallel line and a resonance frequency of a resonator connected in another parallel line, the resonators connected in the parallel line have mutually different resonance frequencies, wherein the compensating resonator has a capacitance that is greater than a capacitance of another resonator.
An acoustic wave device, comprising:
- a ladder-type filter in which a plurality of resonators are series-connected in a parallel line, and include a compensating resonator having a resonance frequency that is higher than a resonance frequency of another resonator connected in the parallel line and a resonance frequency of a resonator connected in another parallel line, the resonators connected in the parallel line have mutually different resonance frequencies;
- and a switching unit able to switch operating of the compensating resonator between ON and OFF.
An acoustic wave device, comprising:
- a ladder-type filter in which a plurality of resonators are series-connected in a parallel line, and include a compensating resonator having a resonance frequency that is higher than a resonance frequency of another resonator connected in the parallel line and a resonance frequency of a resonator connected in another parallel line, the resonators connected in the parallel line have mutually different resonance frequencies, wherein the compensating resonator includes a plurality of resonators that have mutually different resonance frequencies;
- and
- a switching unit that selectively causes one of the plurality of resonators to be in a conduction condition.
An acoustic wave device, comprising:
- a ladder-type filter in which a plurality of resonators are series-connected in a parallel line, and include a compensating resonator having a resonance frequency that is higher than a resonance frequency of another resonator connected in the parallel line and a resonance frequency of a resonator connected in another parallel line, the resonators connected in the parallel line have mutually different resonance frequencies;
- and
- a switching unit able to switch a passband of the compensating resonator.
Dependencies are inferred from the claim text.