Abstract: A smaller size is achieved by reducing a circuit size and the characteristics of all bands are made satisfactory. A radio-frequency module transmits and receives transmission/reception signals in a first frequency band and transmission/reception signals in a second frequency band lower than the first frequency band by time division duplex communication. A switch allows an output from a filter to be input to a low-noise amplifier upon reception of a signal in the second frequency band and allows an output from a power amplifier to be input to the filter upon transmission of a signal in the second frequency band to thereby share the filter for transmission/reception signals in the second frequency band.

Abstract: A filter element is mounted on a module substrate. The filter element includes a ground terminal and a pair of signal terminals. The module substrate includes a ground plane, a ground land, and an inductance adjusting line that connects the ground land to the ground plane. The ground terminal of the filter element is connected to the ground land of the module substrate. The inductance adjusting line includes an in-plane extending portion that extends in an in-plane direction of the module substrate.

Abstract: A filter element is mounted on a module substrate. The filter element includes a ground terminal and a pair of signal terminals. The module substrate includes a ground plane, a ground land, and an inductance adjusting line that connects the ground land to the ground plane. The ground terminal of the filter element is connected to the ground land of the module substrate. The inductance adjusting line includes an in-plane extending portion that extends in an in-plane direction of the module substrate.