Patent ID: 8344954

Claim:
An antenna, comprising: a substrate with a first surface and a second surface that are symmetric; a first radiation unit, disposed on the first surface of the substrate; a first feed point, formed on the second surface of the substrate and penetrating the substrate so as to be electrically connected to the first radiation unit; a first L-shaped grounding unit comprising a bar-shaped element connected with an irregular polygon-shaped element, the first L-shaped grounding unit disposed coplanar with the first radiation unit so that one end of the first L-shaped grounding unit is electrically connected to the first radiation unit, wherein the width of one end of the first L-shape grounding unit is larger than the width of the other end of the first L-shaped grounding unit for increasing operational bandwidth of the first radiation unit; a first gap, formed between the first radiation unit and the first L-shaped grounding unit; and a second feed point, formed on the second surface of the substrate and penetrating the substrate so as to be electrically connected to the first L-shaped grounding unit; wherein the second surface of the substrate is adjacent to at least a metallic component.