Patent ID: 8643450

Claim:
A communication module comprising a variable filter, the variable filter comprising: a substrate; a resonant line that is provided on the substrate, and includes a first line portion and a second line portion extending in a manner to face each other from an input point to which a high-frequency signal is inputted; a movable electrode that is provided above the substrate, and straddles the first line portion and the second line portion in a manner to face the first line portion and the second line portion; and a driving electrode that is provided on the substrate, attracts the movable electrode by an action of a voltage applied between the driving electrode and the movable electrode, and changes a distance between the resonant line and the movable electrode, wherein the driving electrode comprises: a first electrode arranged between the first line portion and the second line portion; a second electrode arranged to interpose the first line portion between the first electrode and the second electrode; and a third electrode arranged to interpose the second line portion between the first electrode and the third electrode.