A communication device comprises a plurality of antennas, a sensing unit, a plurality of radio frequency circuits, and a sensing module. The sensing unit is electrically connected to the ground through at least one grounding capacitor, and the sensing unit is further configured to isolate and be coupled to each antenna. Each the radio frequency circuit is electrically connected to the corresponding each antenna. The sensing module is electrically connected to the sensing unit through an inductor, wherein the sensing module is used to sense the distance between the sensing unit and an external object by the sensing unit, and the sensing module generates a distance signal according to the distance.