Abstract: An acoustic wave device includes an antenna terminal, a signal terminal, and a plurality of resonators that are provided on a piezoelectric substrate. The plurality of resonators include a plurality of series arm resonators on a series arm, and the duty of an IDT electrode of the series arm resonator closest to the antenna terminal among the plurality of series arm resonators is smaller than the duty of an IDT electrode of at least one series arm resonator among the other series arm resonators.

Abstract: An acoustic wave device includes a first acoustic wave chip and a second acoustic wave chip mounted on a substrate, first bumps bonding the first acoustic wave chip to the substrate and including first ground bumps connected to a ground potential, second bumps bonding the second acoustic wave chip to the substrate and including second ground bumps connected to a ground potential. When a number of the first ground bumps is n1, a number of the second ground bumps is n2, a height of the first ground bumps is h1, and a height of the second ground bumps is h2, n1<n2 and h1<h2.

Abstract: A multiplexer includes a plurality of filters, in which one input/output terminal of each of the plurality of filters is connected to a common terminal, a first filter included in the plurality of filters is a ladder filter and includes at least one series arm resonator connected on a path connecting the common terminal and another input/output terminal of the first filter, at least one parallel arm resonator connected between a connection node provided on the path and a ground, and a switch which is connected in series to a parallel arm resonator connected most nearby to the common terminal among at least one parallel arm resonator and switches between conduction and non-conduction of a node to which the parallel arm resonator is connected and the ground.

Abstract: A composite filter device includes first and second filter chips mounted on an upper surface of a substrate by first and second conductive bonds. The first filter chip includes a longitudinally coupled resonator filter. The second filter chip does not include a longitudinally coupled resonator filter. A height of the first conductive bond is lower than a height of the second conductive bond.

Abstract: A multiplexer includes a first filter circuit including a pass band that is a first frequency band, a second filter circuit including a pass band that is a second frequency band, and an additional circuit. The first filter circuit includes a first terminal connected to a common terminal and a second terminal connected to a first input/output terminal. The second filter circuit includes a third terminal connected to the common terminal and a fourth terminal connected to a second input/output terminal. The additional circuit is connected to the fourth terminal and one of the first and second terminals and includes a series-arm circuit on a series-arm path connecting the fourth terminal to the one of the terminals and a parallel-arm circuit on a parallel-arm path connecting the series-arm path to the ground. The parallel-arm circuit includes only an inductor, a capacitor, or an LC parallel-arm resonant circuit in series with the parallel-arm path.

Abstract: In one embodiment, a charged particle beam writing device writes sequentially patterns to a plurality of deflection positions on a target object by deflecting a charged particle beam by a deflector.

Abstract: A composite filter device includes bandpass filters whose respective one ends are electrically connected in common. A first bandpass filter of the bandpass filters includes a first filter, a switch, a second filter, and an impedance element that is electrically connected to the switch and having an impedance value larger than the input impedance value of the second filter. The switch is configured to be switched between a first state in which the first filter and the second filter are electrically connected and a second state in which the first filter and the impedance element are electrically connected.

Abstract: An acoustic wave filter device includes a second filter section connected to a first filter section. The second filter section includes acoustic wave resonators in a ladder circuit configuration. Of the acoustic wave resonators in the first and second filter sections, the acoustic wave resonator having the smallest fractional bandwidth is included in the second filter section. In the second filter section, inductors are respectively connected between parallel arm resonators and a reference potential. Attenuation near a pass band in the second filter section is larger than attenuation near a pass band in the first filter section.

Abstract: A front-end circuit includes an antenna connection terminal, a selection terminal, and a selection terminal, a switching circuit including a common terminal and selection terminals, a receive filter configured to pass a radio-frequency signal in Band B, a signal path connecting the selection terminal and the selection terminal and including the receive filter, a signal path connecting the selection terminal and the selection terminal and defining and functioning as a bypass path without any filter, and a filter coupled between the antenna connection terminal and the common terminal and configured to pass a first frequency range group including Band B.

Abstract: In one embodiment, a charged particle beam writing device writes sequentially patterns to a plurality of deflection positions on a target object by deflecting a charged particle beam by a deflector.

Abstract: A composite filter device includes bandpass filters whose respective one ends are electrically connected in common. A first bandpass filter of the bandpass filters includes a first filter, a switch, a second filter, and an impedance element that is electrically connected to the switch and having an impedance value larger than the input impedance value of the second filter. The switch is configured to be switched between a first state in which the first filter and the second filter are electrically connected and a second state in which the first filter and the impedance element are electrically connected.

Abstract: An electronic module includes a substrate that includes a first main surface and a second main surface, at least one first electronic component that includes electrodes on a mounting surface thereof on the substrate and that includes a hollow portion, at least one second electronic component that includes electrodes on a mounting surface thereof on the substrate and that includes no hollow portion, and a sealing resin. The at least one first electronic component is mounted on the first main surface of the substrate and sealed with the sealing resin. The at least one second electronic component is mounted on the second main surface of the substrate and is not sealed with the sealing resin.

Abstract: A composite filter device includes bandpass filters whose respective one ends are electrically connected in common. A first bandpass filter of the bandpass filters includes a first filter, a switch, a second filter, and an impedance element that is electrically connected to the switch and having an impedance value larger than the input impedance value of the second filter. The switch is configured to be switched between a first state in which the first filter and the second filter are electrically connected and a second state in which the first filter and the impedance element are electrically connected.

Abstract: A filter module includes a filter provided on a path connecting an input/output terminal and an input/output terminal, a filter provided on a path connecting an input/output terminal and an input/output terminal, a switch that switches between electrical connection and electrical disconnection between a wire connected to the input/output terminal and a ground, and a switch that switches between electrical connection and electrical disconnection between a wire connected to the input/output terminal and the ground. When the wire and the ground are electrically connected by the switch, the wire and the ground are electrically disconnected by the switch, and when the wire and the ground are electrically connected by the switch, the wire and the ground are electrically disconnected by the switch.

Abstract: An acoustic wave device includes a piezoelectric substrate, a first band pass filter that is on the piezoelectric substrate and has a first pass band, and a second band pass filter that is on the piezoelectric substrate and has a second pass band at a higher frequency than the first pass band. The first and second band pass filters include resonators that include respective IDT electrodes. When a first total average metallization ratio is defined as an average of metallization ratios of all of the IDT electrodes included in the first filter and a second total average metallization ratio is defined as an average of metallization ratios of all of the IDT electrodes included in the second filter, the first total average metallization ratio is greater than the second total average metallization ratio.

Abstract: A front-end circuit includes an antenna connection terminal, a selection terminal, and a selection terminal, a switching circuit including a common terminal and selection terminals, a receive filter configured to pass a radio-frequency signal in Band B, a signal path connecting the selection terminal and the selection terminal and including the receive filter, a signal path connecting the selection terminal and the selection terminal and defining and functioning as a bypass path without any filter, and a filter coupled between the antenna connection terminal and the common terminal and configured to pass a first frequency range group including Band B.

Abstract: A composite filter device includes an antenna common terminal, a first band pass filter having a first pass band, and a second band pass filter having a second pass band located at higher frequencies than the first pass band. The first band pass filter includes an elastic wave resonator. The elastic wave resonator includes a LiNbO3 substrate, an IDT electrode on the LiNbO3 substrate, and a dielectric film that covers the IDT electrode and includes a silicon oxide as a main component. When f1? is the frequency of a Sezawa wave of the first band pass filter and f2 is the center frequency of the second pass band, f1? is located at a different position from f2.

Abstract: A multiplexer includes a first filter circuit including a pass band that is a first frequency band, a second filter circuit including a pass band that is a second frequency band, and an additional circuit. The first filter circuit includes a first terminal connected to a common terminal and a second terminal connected to a first input/output terminal. The second filter circuit includes a third terminal connected to the common terminal and a fourth terminal connected to a second input/output terminal. The additional circuit is connected to the fourth terminal and one of the first and second terminals and includes a series-arm circuit on a series-arm path connecting the fourth terminal to the one of the terminals and a parallel-arm circuit on a parallel-arm path connecting the series-arm path to the ground. The parallel-arm circuit includes only an inductor, a capacitor, or an LC parallel-arm resonant circuit in series with the parallel-arm path.

Abstract: An acoustic wave device includes an antenna terminal, a signal terminal, and a plurality of resonators that are provided on a piezoelectric substrate. The plurality of resonators include a plurality of series arm resonators on a series arm, and the duty of an IDT electrode of the series arm resonator closest to the antenna terminal among the plurality of series arm resonators is smaller than the duty of an IDT electrode of at least one series arm resonator among the other series arm resonators.

Abstract: An acoustic wave device includes an antenna terminal, a signal terminal, and a plurality of resonators that are provided on a piezoelectric substrate. The plurality of resonators include a plurality of series arm resonators on a series arm, and the duty of an IDT electrode of the series arm resonator closest to the antenna terminal among the plurality of series arm resonators is smaller than the duty of an IDT electrode of at least one series arm resonator among the other series arm resonators.