Antenna structure

An antenna structure, comprising:

• a feeding adjustment element coupled to a first feeding point;
• an asymmetrical radiation element coupled to the feeding adjustment element;
• a first meandering radiation element coupled to a second feeding point;
• a second meandering radiation element coupled to the second feeding point;
• a connection radiation element coupled between the first meandering radiation element and the second meandering radiation element, wherein the first meandering radiation element, the second meandering radiation element, and the connection radiation element collectively form a closed loop structure;
• a first additional radiation element coupled to the connection radiation element, wherein the first additional radiation element is further coupled to the first meandering radiation element, forming a first open slot and a first closed slot between the first meandering radiation element and the first additional radiation element;
• a second additional radiation element coupled to the connection radiation element, wherein the second additional radiation element is further coupled to the second meandering radiation element, forming a second open slot and a second closed slot between the second meandering radiation element and the second additional radiation element;
• and
• a dielectric substrate, wherein the feeding adjustment element, the asymmetrical radiation element, the first meandering radiation element, the second meandering radiation element, the connection radiation element, the first additional radiation element, and the second additional radiation element are disposed on the dielectric substrate.