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US 11,336,252 B2Granted
Radio frequency filter, multiplexer, radio frequency front end circuit, and communication apparatus
AssigneeMurata Manufacturing Co., Ltd.
InventorHirotsugu Mori
Life of this patent
Estimating the term…
Abstract
A filter (10) includes two capacitors (C1a and C1b) that are connected in series on a path connecting an input terminal (101a) and an output terminal (102a), an inductor (L2) that is connected in parallel with a series circuit including the two capacitors (C1a and C1b), and a parallel-arm resonator (P1) that is connected between the ground and a node (N) between the two capacitors (C1a and C1b) on the path.
Claims17
A multiplexer comprising:
- a plurality of filters including a first filter and a second filter, each of the first filter and the second filter including a radio frequency filter, the radio frequency filter comprising:
- two first impedance elements that are connected in series on a path connecting an input terminal and an output terminal;
- a second impedance element that is connected in parallel with a series circuit including the two first impedance elements;
- and
- a parallel-arm resonator that is connected between a ground and a node between the two first impedance elements on the path connecting the input terminal and the output terminal, wherein
- each of the two first impedance elements is one of a capacitor or an inductor, and
- the second impedance element is the other one of the capacitor or the inductor;
- and wherein input terminals or output terminals of the plurality of filters are connected to a common terminal,
- a low pass filter whose input terminal or output terminal is connected to the common terminal,
- the two first impedance elements provided in the first filter and the two first impedance elements provided in the second filter are capacitors, and
- a pass band of the low pass filter is lower than a pass band of the first filter and a pass band of the second filter.
8 more elements
A multiplexer comprising:
- a plurality of filters including a first filter and a second filter, each of the first filter and the second filter including a radio frequency filter, the radio frequency filter comprising:
- two first impedance elements that are connected in series on a path connecting an input terminal and an output terminal;
- a second impedance element that is connected in parallel with a series circuit including the two first impedance elements;
- and
- a parallel-arm resonator that is connected between a ground and a node between the two first impedance elements on the path connecting the input terminal and the output terminal, wherein
- each of the two first impedance elements is one of a capacitor or an inductor, and
- the second impedance element is the other one of the capacitor or the inductor;
- and wherein input terminals or output terminals of the plurality of filters are connected to a common terminal,
- a high pass filter whose input terminal or output terminal is connected to the common terminal,
- the two first impedance elements provided in the first filter and the two first impedance elements provided in the second filter are capacitors, and
- a pass band of the high pass filter is higher than a pass band of the first filter and a pass band of the second filter.
8 more elements
A multiplexer comprising:
- a plurality of filters including a first filter and a second filter, each of the first filter and the second filter including a radio frequency filter, the radio frequency filter comprising:
- two first impedance elements that are connected in series on a path connecting an input terminal and an output terminal;
- a second impedance element that is connected in parallel with a series circuit including the two first impedance elements;
- and
- a parallel-arm resonator that is connected between a ground and a node between the two first impedance elements on the path connecting the input terminal and the output terminal;
- wherein
- each of the two first impedance elements is one of a capacitor or an inductor,
- the second impedance element is the other one of the capacitor or the inductor, and wherein
- input terminals or output terminals of the plurality of filters are connected to the common terminal,
- the two first impedance elements provided in the first filter and the two first impedance elements provided in the second filter are capacitors,
- the parallel-arm resonators provided in the first filter and the second filter are provided into one chip, and
- resonant frequencies of the parallel-arm resonators provided into the one chip are within a range of 200 MHz.
9 more elements
Dependencies are inferred from the claim text.