Filter and multiplexer
AssigneeMurata Manufacturing Co., Ltd.
InventorShinichi Nakamura
Life of this patent
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Abstract
A transmission filter includes a transmission filter circuit and an additional circuit. The transmission filter circuit is provided between a first terminal and a second terminal. Between the first terminal and the second terminal, the additional circuit is connected in parallel with at least a portion of the transmission filter circuit. The additional circuit includes an IDT electrode group including a plurality of IDT electrodes located next to each other in an acoustic wave propagation direction and two reflectors that sandwich the IDT electrode group and having different numbers of pairs of electrode fingers.
Claims14
A filter comprising:
- a filter circuit provided between a first terminal and a second terminal;
- and
- an additional circuit connected in parallel with at least a portion of the filter circuit;
- wherein
- the additional circuit includes an interdigital transducer (IDT) electrode group including a plurality of IDT electrodes arranged in an acoustic wave propagation direction and two reflectors that sandwich the IDT electrode group;
- the two reflectors include different numbers of pairs of electrode fingers;
- and
- one end of each of the plurality of IDT electrodes is connected to ground.
Dependencies are inferred from the claim text.