A filter device is mounted on a module substrate and is shielded by a shield member. The filter device has first and second side surfaces opposed to each other. A ground terminal and signal terminals are formed on a bottom surface of the filter device. The shield member includes side wall portions facing the first and second side surfaces. The filter device includes plural LC parallel resonance circuits therein. The inductors of the LC parallel resonance circuits are arranged in parallel with the first side surface and the bottom surface. Each inductor extends upward from its end portion electrically connected to the ground terminal, extends from the first side surface toward the second side surface, and then extends toward the bottom surface. The gap between the first side surface and the corresponding side wall portion is smaller than that between the second side surface and the corresponding side wall portion.

An electronic component includes a stack and an inductor wound about an axis orthogonal to a stacking direction. The inductor includes a first conductor layer portion and two through hole columns. The first conductor layer portion includes two conductor layers disposed at positions different from each other in the stacking direction and connected in parallel to each other. Area of a first conductor layer is larger than area of a second conductor layer.

An electronic component includes a stack and first to third inductors. Area of a region obtained by perpendicularly projecting a first space including a first axis and surrounded by the first inductor onto an XZ plane is larger than area of a region obtained by perpendicularly projecting a second space including a second axis and surrounded by the second inductor onto a YZ plane. The third inductor is disposed such that a third axis does not intersect the first space but intersects the second space.

An electronic component includes a stack and first to fourth inductors. The second inductor is disposed after the first inductor in a −Y direction. The third inductor and the fourth inductor are disposed after the first inductor and the second inductor, respectively, in a −X direction. Two or more through hole columns are connected in parallel to a part near each end of a conductor layer portion in each of the first inductor and the fourth inductor in a longitudinal direction. One through hole column is connected to a part near each end of a conductor layer portion in each of the second inductor and the third inductor in a longitudinal direction.

An electronic component includes a stack and first and second inductors. The first inductor includes a first through hole column, a second through hole column, a first conductor layer portion, a second conductor layer portion, and a third conductor layer portion. The second conductor layer portion is connected to an end of the first through hole column and extends close to the second through hole column. The third conductor layer portion is connected to the second through hole column and extends close to the first through hole column.

A filter circuit includes a coil component, an inductor, and a capacitor. In the coil component, a first coil and a second coil are magnetically coupled. The inductor is electrically connected to a first end of the first coil and a second end of the second coil and is connected in parallel to the coil component. The capacitor is electrically connected between a ground electrode and an electrode electrically connected to a second end of the first coil and a second end of the coil.

An LC circuit includes a first capacitor provided between a first connection point and a second connection point, a second capacitor provided between the second connection point and a third connection point, a third capacitor provided between the third connection point and a fourth connection point, a fourth capacitor provided between the first connection point and the third connection point, a fifth capacitor provided between the second connection point and the fourth connection point, a first inductor connected to the second connection point, and a second inductor connected to the third connection point.

A filter includes a first resonance circuit including a first capacitor and a first inductor connected in parallel between a ground terminal and a first node electrically connected to a first signal terminal not through any capacitor, no inductor being connected in series with the first capacitor between the first node and the ground terminal, a second resonance circuit including a second capacitor and a second inductor connected in parallel between the ground terminal and a second node electrically connected to a second signal terminal not through any capacitor, and a third resonance circuit including a third capacitor and a third inductor connected in parallel between a third node, located in a path through which a high-frequency signal is transmitted between the first and second nodes, and the ground terminal, and a first series inductor connected in series with the third capacitor between the third node and the ground terminal.

A radio frequency (RF) filter circuit for rejecting one or more spurious components of an input signal has a first resonator circuit including a first capacitor and a first coupled inductor pair of a first inductor and a second inductor, and a second resonator circuit with a second capacitor and a second coupled inductor pair of a third inductor and a fourth inductor. First and second resonator coupling capacitors are connected to the first resonator circuit and the second resonator circuit. A first port and a second port are connected to the first resonator circuit and the second resonator, with the filtered signal of the input signal passed through both the first resonator circuit and the second resonator circuit being output.

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.