Abstract: An amplifier circuit includes a high frequency input terminal and a high frequency output terminal, amplifiers, an output transformer having an input-side coil and an output-side coil, inductors, and a bypass capacitor. An output end of the amplifier is connected to one end of the input-side coil and one end of the inductor. An output end of the amplifier is connected to the other end of the input-side coil and one end of the inductor. The other end of the inductor, the other end of the inductor, and one end of the bypass capacitor are connected to a midpoint of the input-side coil. One end of the output-side coil is connected to the high frequency output terminal.

Abstract: A radio frequency circuit includes an antenna connection terminal, an acoustic wave filter, a power amplifier connected to the acoustic wave filter, a temperature sensor that measures the temperature of either one or both of the acoustic wave filter and the power amplifier, a first variable inductor circuit that includes an inductor disposed in series between the acoustic wave filter and the antenna connection terminal and that has a variable inductance value, and a second variable inductor circuit that includes an inductor connected between the ground and a first path connecting the acoustic wave filter to the antenna connection terminal and that has a variable inductance value.

Abstract: In a high-frequency module, a plurality of filters are connected to a first switch. A plurality of amplifiers are connected to a second switch. A first inductor is disposed on a common path between a second common terminal of the second switch and a first common terminal of the first switch. A plurality of second inductors are disposed, on a one-to-one correspondence, in sections different from the common path, the sections being included in the plurality of respective signal paths. The first inductor is a surface mount inductor located on a first main surface of a mounting substrate. The plurality of second inductors are each an inductor disposed within an IC chip including the plurality of amplifiers or an inductor including a conductive pattern formed in or on the mounting substrate.

Abstract: To provide a radio frequency module and a communication device capable of achieving reduction in height. The radio frequency module includes a mounting substrate and one or more chip inductors. The mounting substrate has a recess at least one end of both ends in a second direction orthogonal to a first direction that is a thickness direction of the mounting substrate. A second chip inductor that is at least one chip inductor of the one or more chip inductors is disposed in the recess.

Abstract: Desired characteristics can be achieved. A radio-frequency circuit includes an inductor and a switch. The inductor has a first end and a second end. The switch has a first input-output terminal, a second input-output terminal, a first switching terminal coupled to the first end of the inductor, and a second switching terminal coupled to the second end of the inductor. The switch can switch between a first state and a second state. In the first state, the first input-output terminal is coupled to the first switching terminal, and the second input-output terminal is coupled to the second switching terminal. In the second state, the first input-output terminal is coupled to the second switching terminal, and the second input-output terminal is coupled to the first switching terminal.

Abstract: An amplifier circuit includes an inductor coupled to an amplifier, an inductor coupled to an amplifier, an inductor provided in series in a first output path connecting the amplifier and the inductor, a capacitor coupled to the first output path and the ground, a capacitor provided in series in a second output path connecting the amplifier and the inductor, an inductor coupled to the second output path and the ground, and a first circuit coupled between a first path connecting the inductors and a second path connecting the capacitor and the inductor.

Abstract: A radio-frequency module includes amplifiers and, a transformer including a primary coil and a secondary coil, an antenna connection terminal, an inductor disposed in series between one end of the secondary coil and the antenna connection terminal, and a capacitor connected between a path connecting the one end of the secondary coil and the inductor and a ground. One end of the primary coil is connected to an output end of the amplifier, another end of the primary coil is connected to an output end of the amplifier, another end of the secondary coil is connected to the ground, and the secondary coil and the inductor are coupled to each other via magnetic field coupling.

Abstract: A radio frequency circuit includes carrier amplifiers and peak amplifiers, transformers, a signal output terminal connected to a first end of an output-side coil, an LC series circuit, and a capacitor. An input-side coil is connected, at its first end, to the carrier amplifier, and is connected, at its second end, to the carrier amplifier. An input-side coil is connected, at its first end, to the peak amplifier, and is connected, at its second end, to the peak amplifier. The LC series circuit is connected between the peak amplifier and the ground. The capacitor is connected to a second end of the output-side coil and a first end of an output-side coil. The output-side coil is connected, at its second end, to the ground.

Abstract: A PA module includes: a multilayer substrate having a ground pattern layer connected to a ground of a power source; amplifier transistors disposed on the multilayer substrate; a bypass capacitor having one end connected to the collector of the amplifier transistor; a first wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a second wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a third wiring line connecting the other end of the bypass capacitor and the ground pattern layer to each other; and a fourth wiring line formed between the amplifier transistor and the ground pattern layer and between the bypass capacitor and the ground pattern layer and connecting the first wiring line and the third wiring line to each other.

Abstract: A PA module includes: a multilayer substrate having a ground pattern layer connected to a ground of a power source; amplifier transistors disposed on the multilayer substrate; a bypass capacitor having one end connected to the collector of the amplifier transistor; a first wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a second wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a third wiring line connecting the other end of the bypass capacitor and the ground pattern layer to each other; and a fourth wiring line formed between the amplifier transistor and the ground pattern layer and between the bypass capacitor and the ground pattern layer and connecting the first wiring line and the third wiring line to each other.

Abstract: Improvement in heat dissipation capability is intended. A radio-frequency module includes a mounting substrate, a plurality of transmission filters, a resin layer, and a shield layer. The mounting substrate has a first major surface and a second major surface opposite to each other. The plurality of transmission filters is mounted on the first major surface of the mounting substrate. The resin layer is disposed on the first major surface of the mounting substrate and covers at least part of an outer peripheral surface of each of the plurality of transmission filters. The shield layer covers the resin layer and at least part of each of the plurality of transmission filters. At least part of a major surface of each of the plurality of transmission filters on an opposite side to the mounting substrate side is in contact with the shield layer.

Abstract: A PA module includes: a multilayer substrate having a ground pattern layer connected to a ground of a power source; amplifier transistors disposed on the multilayer substrate; a bypass capacitor having one end connected to the collector of the amplifier transistor; a first wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a second wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a third wiring line connecting the other end of the bypass capacitor and the ground pattern layer to each other; and a fourth wiring line formed between the amplifier transistor and the ground pattern layer and between the bypass capacitor and the ground pattern layer and connecting the first wiring line and the third wiring line to each other.

Abstract: Isolation characteristics of a directional coupler are improved. A high-frequency module (1) includes a substrate (2) and a directional coupler (5) provided on the substrate (2). The directional coupler (5) includes a main line (51), a sub line (52), and an impedance adjustment portion (7). The sub line (52) is electromagnetically coupled to the main line (51). The impedance adjustment portion (7) is provided in the sub line (52), and adjusts impedance of the directional coupler (5). The impedance adjustment portion (7) is electrically connected to an inductor of the substrate (2).

Abstract: In a high-frequency module, a plurality of filters are connected to a first switch. A plurality of amplifiers are connected to a second switch. A first inductor is disposed on a common path between a second common terminal of the second switch and a first common terminal of the first switch. A plurality of second inductors are disposed, on a one-to-one correspondence, in sections different from the common path, the sections being included in the plurality of respective signal paths. The first inductor is a surface mount inductor located on a first main surface of a mounting substrate. The plurality of second inductors are each an inductor disposed within an IC chip including the plurality of amplifiers or an inductor including a conductive pattern formed in or on the mounting substrate.

Abstract: A radio frequency module includes: a plurality of external connection terminals including at least one input terminal and at least one output terminal; at least one power amplifier; at least one low-noise amplifier; a first switch connected between the at least one input terminal and the at least one power amplifier; a second switch connected between the at least one output terminal and the at least one low-noise amplifier; and a module substrate including a first principal surface and a second principal surface on opposite sides of the module substrate. The first switch is disposed on one of the first principal surface and the second principal surface, and the second switch is disposed on the other of the first principal surface and the second principal surface.

Abstract: To provide a radio frequency module and a communication device capable of achieving reduction in height. The radio frequency module includes a mounting substrate and one or more chip inductors. The mounting substrate has a recess at least one end of both ends in a second direction orthogonal to a first direction that is a thickness direction of the mounting substrate. A second chip inductor that is at least one chip inductor of the one or more chip inductors is disposed in the recess.

Abstract: Desired characteristics can be achieved. A radio-frequency circuit includes an inductor and a switch. The inductor has a first end and a second end. The switch has a first input-output terminal, a second input-output terminal, a first switching terminal coupled to the first end of the inductor, and a second switching terminal coupled to the second end of the inductor. The switch can switch between a first state and a second state. In the first state, the first input-output terminal is coupled to the first switching terminal, and the second input-output terminal is coupled to the second switching terminal. In the second state, the first input-output terminal is coupled to the second switching terminal, and the second input-output terminal is coupled to the first switching terminal.

Abstract: A radio frequency module includes: a plurality of external connection terminals including at least one input terminal and at least one output terminal; at least one power amplifier; at least one low-noise amplifier; a first switch connected between the at least one input terminal and the at least one power amplifier; a second switch connected between the at least one output terminal and the at least one low-noise amplifier; and a module substrate including a first principal surface and a second principal surface on opposite sides of the module substrate. The first switch is disposed on one of the first principal surface and the second principal surface, and the second switch is disposed on the other of the first principal surface and the second principal surface.

Abstract: A PA module includes: a multilayer substrate having a ground pattern layer connected to a ground of a power source; amplifier transistors disposed on the multilayer substrate; a bypass capacitor having one end connected to the collector of the amplifier transistor; a first wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a second wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a third wiring line connecting the other end of the bypass capacitor and the ground pattern layer to each other; and a fourth wiring line formed between the amplifier transistor and the ground pattern layer and between the bypass capacitor and the ground pattern layer and connecting the first wiring line and the third wiring line to each other.

Abstract: A PA module includes: a multilayer substrate having a ground pattern layer connected to a ground of a power source; amplifier transistors disposed on the multilayer substrate; a bypass capacitor having one end connected to the collector of the amplifier transistor; a first wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a second wiring line connecting the emitter of the amplifier transistor and the ground pattern layer to each other; a third wiring line connecting the other end of the bypass capacitor and the ground pattern layer to each other; and a fourth wiring line formed between the amplifier transistor and the ground pattern layer and between the bypass capacitor and the ground pattern layer and connecting the first wiring line and the third wiring line to each other.