Antenna structure

An antenna structure, comprising:

• a first feeding element, coupled to a feeding point;
• a second feeding element, coupled to the feeding point;
• a balun structure, comprising:
• a central ground element, having a central opening;
• a first connection element, coupled to the central ground element, wherein the central ground element is at least partially surrounded by the first connection element;
• a second connection element, coupled to the central ground element;
• a third connection element, coupled to the central ground element, wherein the central ground element is at least partially surrounded by the third connection element;
• and
• a fourth connection element, coupled to the central ground element;
• a first radiation element, coupled to the first connection element, wherein the first radiation element is fed by the first feeding element;
• a second radiation element, coupled to the third connection element, wherein the second radiation element is fed by the second feeding element;
• a third radiation element, disposed adjacent to or coupled to the second connection element;
• a fourth radiation element, disposed adjacent to or coupled to the fourth connection element;
• a fifth radiation element, wherein a first coupling gap is formed between the fifth radiation element and the first radiation element, and a second coupling gap is formed between the fifth radiation element and the third radiation element;
• a sixth radiation element, wherein a third coupling gap is formed between the sixth radiation element and the second radiation element, and a fourth coupling gap is formed between the sixth radiation element and the fourth radiation element;
• and
• a dielectric substrate, having a top surface and a bottom surface;
• wherein the first feeding element and the second feeding element are disposed on the top surface of the dielectric substrate;
• wherein the balun structure, the first radiation element, the second radiation element, the third radiation element, the fourth radiation element, the fifth radiation element, and the sixth radiation element are disposed on the bottom surface of the dielectric substrate.