Abstract: A mobile electronic device includes a ground plane, a first slot, a plurality of first inductive elements, a first antenna, a second antenna, a first signal source, and a second signal source. The first slot is disposed in the ground plane to form a first ground portion and a second ground portion separated from each other. The first inductive elements are respectively connected to the first ground portion and the second ground portion. The first antenna and the second antenna respectively receive a radio-frequency signal in a predetermined band. The first signal source is electrically connected between the first antenna and the first ground portion and receives the radio-frequency signal from the first antenna. The second signal source is electrically connected between the second antenna and the second ground portion and receives the radio-frequency signal from the second antenna.

Abstract: A mobile device includes a carrying element, a first antenna, a second antenna, a connection element, and an extension element. The first antenna and the second antenna are disposed on the carrying element. The first antenna operates in a first frequency band through a first resonance path. The second antenna operates in the first frequency band through a second resonance path. The connection element is electrically connected to the first antenna and the second antenna. The connection element, the first antenna and the second antenna form a connection path, and the connection path, the first resonance path and the second resonance path do not overlap one another. The extension element is electrically connected to the connection element. The extension element, the connection element and the first antenna form a third resonance path, and the first antenna operates in a second frequency band through the third resonance path.

Abstract: A mobile device includes a carrying element, a first antenna, a second antenna, a connection element, and an extension element. The first antenna and the second antenna are disposed on the carrying element. The first antenna operates in a first frequency band through a first resonance path. The second antenna operates in the first frequency band through a second resonance path. The connection element is electrically connected to the first antenna and the second antenna. The connection element, the first antenna and the second antenna form a connection path, and the connection path, the first resonance path and the second resonance path do not overlap one another. The extension element is electrically connected to the connection element. The extension element, the connection element and the first antenna form a third resonance path, and the first antenna operates in a second frequency band through the third resonance path.

Abstract: A mobile electronic device includes a ground plane, a first slot, a plurality of first inductive elements, a first antenna, a second antenna, a first signal source, and a second signal source. The first slot is disposed in the ground plane to form a first ground portion and a second ground portion separated from each other. The first inductive elements are respectively connected to the first ground portion and the second ground portion. The first antenna and the second antenna respectively receive a radio-frequency signal in a predetermined band. The first signal source is electrically connected between the first antenna and the first ground portion and receives the radio-frequency signal from the first antenna. The second signal source is electrically connected between the second antenna and the second ground portion and receives the radio-frequency signal from the second antenna.

Abstract: An electronic device including a ground plane, a metal frame, a plurality of radiation elements and a switching circuit is provided. A first end of a frame element in the metal frame is connected to the ground plane, and a second end of the frame element is an open end. Each of the radiation elements is spaced by a coupling distance from the frame element. The switching circuit transmits a feeding signal to one of the radiation elements. When the feeding signal is transmitted to a first radiation element among the radiation elements, the electronic device operates in a first band and a second band through the first radiation element and the frame element. When the feeding signal is transmitted to a second radiation element among the radiation elements, the electronic device operates in a third band and a fourth band through the second radiation element and the frame element.

Abstract: An electronic device including a ground plane, a metal frame, a plurality of radiation elements and a switching circuit is provided. A first end of a frame element in the metal frame is connected to the ground plane, and a second end of the frame element is an open end. Each of the radiation elements is spaced by a coupling distance from the frame element. The switching circuit transmits a feeding signal to one of the radiation elements. When the feeding signal is transmitted to a first radiation element among the radiation elements, the electronic device operates in a first band and a second band through the first radiation element and the frame element. When the feeding signal is transmitted to a second radiation element among the radiation elements, the electronic device operates in a third band and a fourth band through the second radiation element and the frame element.

Abstract: A mobile communication device includes a substrate, a frame, a ground plane, and an antenna element. The substrate includes a first surface and a side wall. The frame includes a frame portion adjacent to the side wall. The ground plane is arranged on the first surface and includes a notch. An opening of the notch faces the frame portion. The antenna element includes a first radiation portion having a feeding point, a second radiation portion electrically connected to the ground plane, a third radiation portion electrically connected to the first radiation portion, and a fourth radiation portion electrically connected to the second radiation portion. Orthogonal projections of the first and second radiation portions on the first surface are located in the notch of the ground plane, and the third and fourth radiation portions are located on the frame portion or the side wall of the substrate.