Abstract: A front end module that performs a CA method includes a signal path through which a signal of a first frequency band propagates, a signal path through which a signal of a second frequency band propagates, a switch module that includes antenna terminals and selection terminals and is connected to antenna elements, and a balun that is disposed at the signal path. First and second balanced terminals of the balun are connected to the selection terminals, and the balun causes a fundamental wave or harmonic of a transmission signal of the first frequency band input through an unbalanced terminal to branch into branch signals having opposite phases and outputs the branch signals to the first balanced terminal and the second balanced terminal.

Abstract: An inductor component is disposed outside a multilayer substrate, and thus a directional coupler defined by an internal wiring electrode and a coil electrode within the inductor component that is mounted on a pair of land electrodes, the multilayer substrate significantly reduces or prevents interference with other high-frequency circuit elements disposed in or on the multilayer substrate. Additionally, if a plurality of inductor components having different inductor characteristics are prepared, a high-frequency module including the multilayer substrate capable of defining the directional coupler whose characteristics are able to adjusted with ease is able to be provided simply by selecting the desired inductor component from the inductor components and replacing that inductor component.

Abstract: An inductor component is disposed outside a multilayer substrate, and thus a directional coupler defined by an internal wiring electrode and a coil electrode within the inductor component that is mounted on a pair of land electrodes, the multilayer substrate significantly reduces or prevents interference with other high-frequency circuit elements disposed in or on the multilayer substrate. Additionally, if a plurality of inductor components having different inductor characteristics are prepared, a high-frequency module including the multilayer substrate capable of defining the directional coupler whose characteristics are able to adjusted with ease is able to be provided simply by selecting the desired inductor component from the inductor components and replacing that inductor component.

Abstract: A front end circuit includes a switch including a common terminal and a plurality of individual terminals, in which at least two kinds of reception signals of different frequency bands are input to the common terminal, and in which one of the at least two kinds of reception signals is output to an individual terminal selected from the plurality of individual terminals, and in which a non-selected terminal is grounded, and a balun including a first terminal and a second terminal defining unbalanced ports as well as a third terminal and a fourth terminal defining balanced ports. The first individual terminal of the switch is indirectly connected to the first terminal of the balun and the second individual terminal of the switch is indirectly connected to the second terminal of the balun. The at least two kinds of reception signals are output in a balanced mode from the third terminal and the fourth terminal of the balun.

Abstract: A front end circuit includes a switch including a common terminal and a plurality of individual terminals, in which at least two kinds of reception signals of different frequency bands are input to the common terminal, and in which one of the at least two kinds of reception signals is output to an individual terminal selected from the plurality of individual terminals, and in which a non-selected terminal is grounded, and a balun including a first terminal and a second terminal defining unbalanced ports as well as a third terminal and a fourth terminal defining balanced ports. The first individual terminal of the switch is indirectly connected to the first terminal of the balun and the second individual terminal of the switch is indirectly connected to the second terminal of the balun. The at least two kinds of reception signals are output in a balanced mode from the third terminal and the fourth terminal of the balun.

Abstract: In a branching device, an LPF includes a first inductor arranged such that some conductor layers from among conductor layers are wound in a clockwise direction, and a second inductor arranged such that a conductor layer from among the conductor layers is wound in an counterclockwise direction. In addition, an HPF includes a third inductor arranged such that conductor layers are wound in the same clockwise direction as the first inductor. Therefore, when a high-frequency signal passes through the LPF, a winding direction is reversed. In addition, when a high-frequency signal passes through the HPF, a winding direction is reversed.

Abstract: In a branching device, an LPF includes a first inductor arranged such that some conductor layers from among conductor layers are wound in a clockwise direction, and a second inductor arranged such that a conductor layer from among the conductor layers is wound in an counterclockwise direction. In addition, an HPF includes a third inductor arranged such that conductor layers are wound in the same clockwise direction as the first inductor. Therefore, when a high-frequency signal passes through the LPF, a winding direction is reversed. In addition, when a high-frequency signal passes through the HPF, a winding direction is reversed.