Communication device and antenna thereof

A communication device, comprising:

• a metal frame defining an opening, the metal frame having a first part, a second part located at a position different from a position of the first part, a third part, and a fourth part located at a position different from a position of the third part;
• a display module;
• a display panel installed between the display module and the metal frame, and corresponding to the opening of the metal frame;
• a metal back cover;
• a printed circuit board, comprising a first circuit block and a second circuit block electrically connected to the first circuit block, each of the first and second circuit blocks comprising a signal terminal and a ground terminal, wherein the ground terminal contacts the metal back cover;
• a main body located between the metal frame and the metal back cover, the main body being made of a non-conductive material;
• a first conductor connected between the first part of the metal frame and the signal terminal of the first circuit block of the print circuit board;
• a second conductor connected between the second part of the metal frame and the ground terminal of the first circuit block of the print circuit board;
• a third conductor connected to the third part of the metal frame;
• and
• a fourth conductor connected to the ground terminal of the second circuit block of the print circuit board, at least one coupling gap being defined between the third conductor and the fourth conductor;
• wherein the signal terminal of the second circuit block of the printed circuit board is electrically connected to the fourth part of the metal frame.