Patent ID: 8416136

Claim:
A monopole antenna disposed on a substrate with a first surface and a second surface, comprising: a feeding point disposed on the first surface of the substrate, inputting and outputting electrical signals corresponding to the electromagnetic-wave signals; a radiation unit disposed on the first surface of the substrate, comprising: a feeding section, having one end electrically connected to the feeding point; a first radiation section, having one end electrically connected to the other end of the feeding section; a second radiation section, having one end electrically connected to the other end of the first radiation section, wherein the second radiation section and the feeding section are respectively placed at two sides of a longitudinal axis of the first radiation section; and a third radiation section, having one end electrically connected to the first radiation section, wherein the third radiation section and the feeding section are respectively placed at the two sides of the longitudinal axis of the first radiation section; and a reflecting element, disposed on the second surface of the substrate, and corresponding to a position of the second radiation section.