Antenna system

An antenna system, comprising:

• a first radiation element, having a first feeding point;
• a second radiation element, wherein the second radiation element is adjacent to the first radiation element;
• a third radiation element, having a second feeding point;
• a fourth radiation element, wherein the fourth radiation element is adjacent to the third radiation element;
• a tunable circuit, coupled to a ground voltage, wherein the tunable circuit provides a variable impedance value according to a control signal;
• a fifth radiation element, wherein the second radiation element and the fourth radiation element are coupled through the fifth radiation element to the tunable circuit;
• a sixth radiation element, coupled to the ground voltage, wherein the sixth radiation element is adjacent to the third radiation element;
• and
• a seventh radiation element, coupled to the fourth radiation element, wherein the seventh radiation element is adjacent to the second radiation element;
• wherein a first antenna structure is formed by the first radiation element, the second radiation element, and the fifth radiation element;
• wherein a second antenna structure is formed by the third radiation element, the fourth radiation element, the fifth radiation element, the sixth radiation element, and the seventh radiation element.