Abstract: A communication device includes a ground element and an antenna element. The antenna element is disposed on a dielectric substrate which is adjacent to an edge of the ground element. The antenna element includes a radiating element, a shorting element and a feeding element. The radiating element has a first open end, a second open end and a shorting point. The radiating element is divided into a first element and a second element by the shorting point. The first element includes the first open end, and the second element includes the second open end. One end of the shorting element is coupled to the shorting point through a first inductive element, and another end is electrically connected to the ground element. The feeding element and the first element are spaced by a coupling gap, and the feeding element is coupled to a signal source through a matching circuit.

Abstract: A communication device including a ground element and an antenna element is provided. The antenna element includes a metal element, a first feeding branch, and a second feeding branch. The metal element is disposed adjacent to an edge of the ground element. The first feeding branch and the second feeding branch are respectively coupled to a first feeding point and a second feeding point on the metal element, such that the antenna element substantially has an inverted-F shape. The first feeding branch includes a first reactance circuit, and the first feeding point is coupled through the first reactance circuit to a first signal source. The second feeding branch includes a second reactance circuit, and the second feeding point is coupled through the second reactance circuit to a second signal source.

Abstract: A communication device includes a ground element and an antenna element. The antenna element is disposed on a dielectric substrate which is adjacent to an edge of the ground element. The antenna element includes a radiating element, a shorting element and a feeding element. The radiating element has a first open end, a second open end and a shorting point. The radiating element is divided into a first element and a second element by the shorting point. The first element includes the first open end, and the second element includes the second open end. One end of the shorting element is coupled to the shorting point through a first inductive element, and another end is electrically connected to the ground element. The feeding element and the first element are spaced by a coupling gap, and the feeding element is coupled to a signal source through a matching circuit.