Filter, duplexer and communication module
AssigneeTaiyo Yuden Co., Ltd.
InventorsMOTOAKI HARA, SHOGO INOUE, MASAFUMI IWAKI, JUN TSUTSUMI, MASANORI UEDA
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Abstract
According to an aspect of the invention, each of a filter, a duplexer and a communication module includes a plurality of series resonators connected to a signal line in series and a plurality of parallel resonators connected to the signal line in parallel. At least two of the plurality of parallel resonators are connected to the signal line between two of the plurality of series resonators in parallel, inductors are respectively connected to the at least two parallel resonators, and the inductors have different inductances from each other.
Claims11
A filter comprising a plurality of series resonators connected to a signal line in series and a plurality of parallel resonators connected to the signal line in parallel,
- wherein at least two parallel resonators that are adjacent to each other among the plurality of parallel resonators are connected to the signal line between two adjacent ones of the plurality of series resonators in parallel, and another parallel resonator is connected to the signal line at a location other than between said two adjacent ones of the plurality of series resonators connected in series,
- an inductor is connected to only one of said at least two parallel resonators in series, said inductor being not shared with any other parallel resonators,
- a second inductor is connected to said another parallel resonators, and
- the first and second inductors have different inductances from each other.
A duplexer comprising a transmission filter and a reception filter,
- wherein at least one of the transmission filter and the reception filter includes a plurality of series resonators connected to a signal line in series and a plurality of parallel resonators connected to the signal line in parallel,
- wherein at least two parallel resonators that are adjacent to each other among the plurality of parallel resonators are connected to the signal line between two adjacent ones of the plurality of series resonators in parallel, and another parallel resonator is connected to the signal line at a location other than between said two adjacent ones of the plurality of series resonators connected in series,
- an inductor is connected to only one of said at least two parallel resonators in series, said inductor being not shared with any other parallel resonators,
- a second inductor is connected to said another parallel resonators, and
- the first and second inductors have different inductances from each other.
A communication module comprising a transmission filter and a reception filter,
- wherein at least one of the transmission filter and the reception filter includes a plurality of series resonators connected to a signal line in series and a plurality of parallel resonators connected to the signal line in parallel,
- wherein at least two parallel resonators that are adjacent to each other among the plurality of parallel resonators are connected to the signal line between two adjacent ones of the plurality of series resonators in parallel, and another parallel resonator is connected to the signal line at a location other than between said two adjacent ones of the plurality of series resonators connected in series,
- an inductor is connected to only one of said at least two parallel resonators in series, said inductor being not shared with any other parallel resonators,
- a second inductor is connected to said another parallel resonators, and
- the first and second inductors have different inductances from each other.
Dependencies are inferred from the claim text.