Wideband antenna

A wideband antenna for a wireless communication device, comprising:

• a grounding element;
• a radiating element, extending in a first direction, for transmitting and receiving wireless signals;
• a feed-in terminal electrically connected to the radiating element, for transmitting a feed-in signal to the radiating element;
• and
• a first parasitic radiating element, extending in the first direction, having a side separated from a side of the radiating element by a first distance, and another side separated from the grounding element by a second distance, and the feed-in terminal and the grounding element are substantially separated by at least the first parasitic radiating element;
• wherein the first distance allows the first parasitic radiating element and the radiating element to generate a coupling effect to form a slot antenna for transmitting and receiving wireless signals, and the second distance allows the first parasitic radiating element and the grounding element to generate a coupling effect to form a coupling path to the grounding element to increase bandwidth.