Abstract: An antenna structure includes a ground element, a first radiation element, a second radiation element, a third radiation element, and a nonconductive support element. The first radiation element is coupled to a first grounding point on the ground element. The second radiation element has a feeding point. The second radiation element is adjacent to the first radiation element. The third radiation element is coupled to a second grounding point on the ground element. The third radiation element is adjacent to the second radiation element. The first radiation element, the second radiation element, and the third radiation element are disposed on the nonconductive support element. The second radiation element is at least partially surrounded by the first radiation element. The third radiation element is at least partially surrounded by the second radiation element.

Abstract: An antenna structure includes a metal mechanism element, a first radiation element, a second radiation element, a third radiation element, and a dielectric substrate. The metal mechanism element has a slot with a first closed end and a second closed end. The first radiation element has a feeding point. The second radiation element is coupled to the feeding point. The second radiation element and the first radiation element substantially extend away from each other. The third radiation element is coupled to a ground voltage. The third radiation element extends across the slot of the metal mechanism element. The dielectric substrate has a first surface and a second surface opposite to each other. The first radiation element, the second radiation element, and the third radiation element are disposed on the first surface of the dielectric substrate. The second surface of the dielectric substrate is adjacent to the slot.

Abstract: An antenna structure includes a ground plane, a first radiation element, a second radiation element, a third radiation element, and a dielectric substrate. The ground plane provides a ground voltage. The first radiation element includes a connection branch, a first branch, and a second branch. The connection branch has a feeding point. The first branch and the second branch substantially extend in opposite directions. The second radiation element is coupled to the feeding point. The second radiation element substantially surrounds a non-metal region, and is further coupled to the ground voltage. The third radiation element is coupled to the ground voltage. The third radiation element is adjacent to the first radiation element. The first radiation element, the second radiation element, and the third radiation element are all disposed on the dielectric substrate.

Abstract: An antenna structure includes a nonconductive supporting element, a feeding radiation element, a first radiation element, a second radiation element, a third radiation element, and a fourth radiation element. The first radiation element is coupled to a ground voltage. A first coupling gap is formed between the first radiation element and the feeding radiation element. The second radiation element is coupled to the first radiation element. A second coupling gap is formed between the second radiation element and the feeding radiation element. The third radiation element is coupled to the first radiation element. The fourth radiation element is coupled to the ground voltage. A third coupling gap is formed between the fourth radiation element and the feeding radiation element. The feeding radiation element, the first radiation element, the second radiation element, the third radiation element, and the fourth radiation element are all disposed on the nonconductive supporting element.

Abstract: An antenna structure includes a ground plane, a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, and a dielectric substrate. The first radiation element has a feeding point. The second radiation element is coupled to the feeding point. The non-metal region is substantially surrounded by the first radiation element and the second radiation element. The third radiation element is coupled to a first shorting point on the ground plane. The third radiation element is adjacent to the first radiation element and the second radiation element. The fourth radiation element is coupled to a second shorting point on the ground plane. The fourth radiation element is adjacent to the second radiation element. The ground plane, the first radiation element, the second radiation element, the third radiation element, and the fourth radiation element are all disposed on the dielectric substrate.

Abstract: An antenna structure includes a ground plane, a first radiation element, a second radiation element, a third radiation element, and a fourth radiation element. A closed slot is formed in the ground plane. The first radiation element has a feeding point. The first radiation element is coupled to a first shorting point on the ground plane. The second radiation element is coupled to a second shorting point on the ground plane. The second radiation element is adjacent to the first radiation element. The third radiation element is coupled to the feeding point. The fourth radiation element is coupled to a third shorting point on the ground plane. The fourth radiation element is adjacent to the third radiation element. The first radiation element, the second radiation element, the third radiation element, and the fourth radiation element are all disposed inside the closed slot.

Abstract: An antenna structure includes a ground element, a feeding radiation element, a first radiation element, a second radiation element, a third radiation element, a first capacitor, and a second capacitor. The ground element has a notch region. The feeding radiation element has a feeding point. The first radiation element is coupled to the ground element. The first capacitor is coupled between the feeding radiation element and the first radiation element. The second radiation element is coupled to the ground element. The second capacitor is coupled between the first radiation element and the second radiation element. The third radiation element is coupled to the feeding radiation element. The feeding radiation element, the first radiation element, the second radiation element, the third radiation element, the first capacitor, and the second capacitor are all disposed inside the notch region of the ground element.

Abstract: An antenna structure includes a ground plane, a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, and a dielectric substrate. The first radiation element has a feeding point. The second radiation element is coupled to the feeding point. The non-metal region is substantially surrounded by the first radiation element and the second radiation element. The third radiation element is coupled to a first shorting point on the ground plane. The third radiation element is adjacent to the first radiation element and the second radiation element. The fourth radiation element is coupled to a second shorting point on the ground plane. The fourth radiation element is adjacent to the second radiation element. The ground plane, the first radiation element, the second radiation element, the third radiation element, and the fourth radiation element are all disposed on the dielectric substrate.

Abstract: An antenna structure includes a ground plane, a first radiation element, a second radiation element, a third radiation element, and a dielectric substrate. The ground plane provides a ground voltage. The first radiation element includes a connection branch, a first branch, and a second branch. The connection branch has a feeding point. The first branch and the second branch substantially extend in opposite directions. The second radiation element is coupled to the feeding point. The second radiation element substantially surrounds a non-metal region, and is further coupled to the ground voltage. The third radiation element is coupled to the ground voltage. The third radiation element is adjacent to the first radiation element. The first radiation element, the second radiation element, and the third radiation element are all disposed on the dielectric substrate.

Abstract: An antenna structure includes a ground plane, a first radiation element, a second radiation element, a third radiation element, and a fourth radiation element. A closed slot is formed in the ground plane. The first radiation element has a feeding point. The first radiation element is coupled to a first shorting point on the ground plane. The second radiation element is coupled to a second shorting point on the ground plane. The second radiation element is adjacent to the first radiation element. The third radiation element is coupled to the feeding point. The fourth radiation element is coupled to a third shorting point on the ground plane. The fourth radiation element is adjacent to the third radiation element. The first radiation element, the second radiation element, the third radiation element, and the fourth radiation element are all disposed inside the closed slot.

Abstract: A mobile device includes a metal mechanism element, a dielectric substrate, and a feeding radiation element. The metal mechanism element has an open slot. The open slot substantially has an L-shape. The dielectric substrate is adjacent to the metal mechanism element. The feeding radiation element has a feeding point. The feeding radiation element is disposed on the dielectric substrate. The feeding radiation element at least partially extends along the open slot. An antenna structure is formed by the feeding radiation element and the open slot of the metal mechanism element. The antenna structure covers a first frequency band, a second frequency band, and a third frequency band.

Abstract: An antenna structure includes a nonconductive supporting element, a feeding radiation element, a first radiation element, a second radiation element, a third radiation element, and a fourth radiation element. The first radiation element is coupled to a ground voltage. A first coupling gap is formed between the first radiation element and the feeding radiation element. The second radiation element is coupled to the first radiation element. A second coupling gap is formed between the second radiation element and the feeding radiation element. The third radiation element is coupled to the first radiation element. The fourth radiation element is coupled to the ground voltage. A third coupling gap is formed between the fourth radiation element and the feeding radiation element. The feeding radiation element, the first radiation element, the second radiation element, the third radiation element, and the fourth radiation element are all disposed on the nonconductive supporting element.

Abstract: An antenna structure includes a ground element, a feeding radiation element, a first radiation element, a second radiation element, a third radiation element, a first capacitor, and a second capacitor. The ground element has a notch region. The feeding radiation element has a feeding point. The first radiation element is coupled to the ground element. The first capacitor is coupled between the feeding radiation element and the first radiation element. The second radiation element is coupled to the ground element. The second capacitor is coupled between the first radiation element and the second radiation element. The third radiation element is coupled to the feeding radiation element. The feeding radiation element, the first radiation element, the second radiation element, the third radiation element, the first capacitor, and the second capacitor are all disposed inside the notch region of the ground element.

Abstract: An antenna structure includes a nonconductive supporting element, a feeding radiation element, a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, and a tuning radiation element. The first radiation element is coupled to the feeding point. The second radiation element is coupled to the feeding radiation element. The third radiation element is coupled to the feeding radiation element. A slot region is formed between the second radiation element and the third radiation element. The fourth radiation element is coupled to a ground voltage. A coupling gap is formed between the fourth radiation element and the third radiation element. The tuning radiation element is coupled to the fourth radiation element. The feeding radiation element, the first radiation element, the second radiation element, the third radiation element, the fourth radiation element, and the tuning radiation element are disposed on the nonconductive supporting element.

Abstract: A mobile device includes a metal mechanism element, a dielectric substrate, and a feeding radiation element. The metal mechanism element has an open slot. The open slot substantially has an L-shape. The dielectric substrate is adjacent to the metal mechanism element. The feeding radiation element has a feeding point. The feeding radiation element is disposed on the dielectric substrate. The feeding radiation element at least partially extends along the open slot. An antenna structure is formed by the feeding radiation element and the open slot of the metal mechanism element. The antenna structure covers a first frequency band, a second frequency band, and a third frequency band.

Abstract: A mobile device includes a main circuit board, a PCB (Printed Circuit Board), a feeding connection element, a grounding connection element, a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, and a fifth radiation element. The first radiation element is coupled to the feeding connection element. The second radiation element is coupled to the feeding connection element. The third radiation element is coupled to the grounding connection element. The fourth radiation element is coupled to the first radiation element. The fifth radiation element is coupled to the feeding connection element. The feeding connection element, the grounding connection element, the first radiation element, and the second radiation element are disposed on the main circuit board. The third radiation element, the fourth radiation element, and the fifth radiation element are disposed on the PCB.

Abstract: A mobile device includes a main circuit board, a PCB (Printed Circuit Board), a feeding connection element, a grounding connection element, a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, and a fifth radiation element. The first radiation element is coupled to the feeding connection element. The second radiation element is coupled to the feeding connection element. The third radiation element is coupled to the grounding connection element. The fourth radiation element is coupled to the first radiation element. The fifth radiation element is coupled to the feeding connection element. The feeding connection element, the grounding connection element, the first radiation element, and the second radiation element are disposed on the main circuit board. The third radiation element, the fourth radiation element, and the fifth radiation element are disposed on the PCB.

Abstract: A wearable device worn by a user includes a base, an antenna structure, a ground plane, and a metal element. The base substantially has a hollow structure. The antenna structure is disposed on the base. The ground plane is disposed inside the base. The metal element is adjacent to the ground plane. The ground plane is positioned between the antenna structure and the metal element.

Abstract: A mobile device includes a nonconductive mechanism element and an antenna structure. The antenna structure is formed over the nonconductive mechanism element. The antenna structure includes a feeding connection element, a first radiation element, a second radiation element, a grounding connection element, and a third radiation element. The feeding connection element is coupled to a feeding point. A first end of the first radiation element is coupled to the feeding connection element, and a second end of the first radiation element is open. A first end of the second radiation element is coupled to the feeding connection element, and a second end of the second radiation element is open. The grounding connection element is coupled to a grounding point. A first end of the third radiation element is coupled to the grounding connection element, and a second end of the third radiation element is open.

Abstract: An antenna structure includes a ground plane, a first feeding element, a second feeding element, a connection element, a first radiation element, a second radiation element, a third radiation element, a first tuning circuit, a second tuning circuit, a third tuning circuit, and a fourth tuning circuit. The ground plane has a notch region. The first tuning circuit is coupled between a signal source and the first feeding element. The second tuning circuit is coupled between the first feeding element and the second feeding element. The third tuning circuit is coupled between the second feeding element and the ground plane. The first radiation element is coupled to the first feeding element. The fourth tuning circuit is coupled between the first radiation element and the ground plane. Both the second radiation element and the third radiation element are coupled through the connection element to the second feeding element.