Electronic device and antenna assembly thereof

An electronic device, comprising:

• a display screen;
• a metal foothold, the display screen being installed at the metal foothold;
• a motherboard, disposed at the metal foothold, the display screen and the motherboard being located at two opposite surfaces of the metal foothold;
• an antenna assembly, disposed at the metal foothold and electrically connected to the motherboard, the antenna assembly comprising:
• a metal frame, disposed at the metal foothold, at least one side of the metal frame comprising an opening;
• a plastic sheet, embedded in the opening;
• at least one antenna, comprising:
• an antenna main board, disposed at the plastic sheet and comprising a first surface, a second surface, and a conductive hole;
• a double-sided antenna, comprising a first antenna pattern and a second antenna pattern, wherein the first antenna pattern and the second antenna pattern are disposed at the first surface and the second surface of the antenna main board, respectively, the second antenna pattern comprises a feed end and a ground end, and a signal transmitted through the feed end is conducted to the first antenna pattern through the conductive hole;
• and
• a conductive sheet, connected to the ground end and lapped over the metal frame.