Patent ID: 7639194

Claim:
A dual-band loop antenna comprising: a ground plane in a substantially rectangular shape, said ground plane comprising a grounding point and a shorting point; a radiating metallic loop, said radiating metallic loop comprising a feeding end and a shorting end, said feeding end and said shorting end being spaced from each other at a predetermined distance, said shorting end being electrically connected to said shorting point of said ground plane; and a radiating metallic plate of an inverted-L shape surrounded by said radiating metallic loop, said radiating metallic plate comprising one end electrically connected to a vicinity around the shorting end of said radiating metallic loop and spaced from the shorting end of said radiating metallic loop at a distance shorter than 10 mm; wherein the dual-band loop antenna generates a half-wavelength mode and a full-wavelength mode subject to the resonance of said radiating metallic loop, and an additional half-wavelength mode subject to the coupling between said radiating metallic plate and said radiating metallic loop.