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An antenna structure includes the following. A first radiation element has a feeding point. A second radiation element is coupled to the feeding point. A third radiation element is coupled through a capacitive element to the second radiation element. A fourth radiation element is coupled through a tunable circuit to a ground element. The fourth radiation element is adjacent to the first radiation element. A fifth radiation element is coupled to the fourth radiation element. A nonconductive support element has a first surface and a second surface which are opposite to each other. The first radiation element, the second radiation element, the capacitive element, the third radiation element, and the fourth radiation element are disposed on the first surface. The fifth radiation element is disposed on the second surface.

An antenna structure includes a ground element, a first radiation element, a second radiation element, a third radiation element, a nonconductive support element, and a metal mechanism element. The first radiation element has a feeding point. The second radiation element is coupled to a first grounding point on the ground element and 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 first radiation element. The first radiation element is between the second radiation element and the third radiation element. The ground element, the first radiation element, the second radiation element, and the third radiation element are disposed on the nonconductive support element. The metal mechanism element has a slot.

An antenna structure includes a first radiation element, a second radiation element, a third radiation element, an inductor, and a dielectric substrate. The first radiation element has a first feeding point. The second radiation element has a second feeding point. The second radiation element is adjacent to the first radiation element. The third radiation element is coupled through the inductor to the second radiation element. The first radiation element, the second radiation element, and the third radiation element are all disposed on the dielectric substrate.

An antenna structure includes a feeding adjustment element, an asymmetrical radiation element, a first meandering radiation element, a second meandering radiation element, a connection radiation element, a first additional radiation element, a second additional radiation element, and a dielectric substrate. A closed loop structure is formed by the first meandering radiation element, the second meandering radiation element, and the connection radiation element. The first additional radiation element is coupled to the connection radiation element and the first meandering radiation element. A first open slot and a first closed slot are formed between the first meandering radiation element and the first additional radiation element. The second additional radiation element is coupled to the connection radiation element and the second meandering radiation element. A second open slot and a second closed slot are formed between the second meandering radiation element and the second additional radiation element.

An antenna structure includes a coaxial cable, a first radiation element, a second radiation element, a connection radiation element, a third radiation element, and a nonconductive support element. The coaxial cable includes a central conductor and a conductive housing. The central conductor is coupled to a feeding point. The conductive housing is coupled to a first grounding point. The first radiation element is coupled to the feeding point. The first radiation element is adjacent to the conductive housing. The second radiation element is coupled to a second grounding point. The second radiation element is adjacent to the conductive housing. The connection radiation element is coupled between the first radiation element and the second radiation element. The connection radiation element is also coupled to a connection point on the conductive housing. The third radiation element is coupled to the connection radiation element.

An antenna structure includes a ground element, a metal cavity, a first radiation element, a second radiation element, a third radiation element, and a capacitive element. The metal cavity includes a first edge segment and a second edge segment which are opposite to each other. The first edge segment is coupled to the ground element. The first radiation element has a feeding point. The first radiation element is adjacent to the second edge segment. The second radiation element is coupled to the first edge segment. The second radiation element is adjacent to the first radiation element. The third radiation element is coupled to the second edge segment. The capacitive element is coupled between the first edge segment and the second edge segment. The first radiation element, the second radiation element, and the third radiation element are disposed between the first edge segment and the second edge segment.

An antenna structure includes a metal mechanism element, a feeding radiation element, a first radiation element, a second radiation element, a third radiation element, a fourth radiation element, a fifth radiation element, a sixth radiation element, and a tuning circuit. A slot is formed in the metal mechanism element. The first radiation element is coupled to the feeding radiation element. The tuning circuit is coupled to the first radiation element. The second radiation element is coupled to the feeding radiation element. The third radiation element is coupled to a first grounding point on the metal mechanism element. The fourth radiation element is coupled to a second grounding point on the metal mechanism element. The fifth radiation element is coupled to a third grounding point on the metal mechanism element.

An antenna structure includes a ground element, a feeding radiation element, a connection radiation element, a coupling radiation element, a first shorting radiation element, and a second shorting radiation element. The feeding radiation element has a feeding point. The coupling radiation element is coupled through the connection radiation element to the feeding radiation element. The coupling radiation element is also coupled through the first shorting radiation element to a first grounding point on the ground element. The feeding radiation element is also coupled through the second shorting radiation element to a second grounding point on the ground element. A loop structure is formed by the ground element, the connection radiation element, the first shorting radiation element, and the second shorting radiation element.

A coupler adapted to be connected to a power source and a rotatable member. The coupler includes a plate body and a coupler protrusion. A coupler groove is formed on the plate body, and the power source is adapted to be wedged into the coupler groove. The coupler protrusion is disposed on the plate body and adapted to be wedged into the rotatable member.

An antenna device and a communication apparatus. The antenna device includes a base, a standing member, an arm, and a first radiation portion. The standing member is connected to and stands on the base. The arm includes a first arm and a second arm, and the arm is connected to the standing member. The first radiation portion includes a first part and a second part that are symmetrical to each other, the first part of the first radiation portion is connected to the first arm, and the second part of the first radiation portion is connected to the second arm. The arm and the base are connected to different positions of the standing member, such that there is a distance between the arm and the base in a direction perpendicular to the base.