Patent ID: 6977616

Claim:
A dual-band antenna, comprising: a first radiating conductive plate arranged to oppose a grounding conductor in an approximately parallel manner on a surface of the grounding conductor, the first radiating conductive plate being excited at a first frequency; a feeding conductive plate extending approximately orthogonally from an outer edge of the first radiating conductive plate and connected to a feeding circuit; a second radiating conductive plate extending in approximately parallel to the feeding conductive plate, whose lower end is connected to the feeding conductive plate and an upper end opposes a bottom surface of the first radiating conductive plate; a third radiating conductive plate arranged to oppose a grounding conductor in an approximately parallel manner on a surface of the grounding conductor, the third radiating conductive plate being adjacent to the first radiating conductive plate with a slit interposed therebetween; and a first shorting conductive plate extending approximately orthogonally from an outer edge of the third radiating conductive plate and connected to the surface of the grounding conductor, wherein the second radiating conductive plate is excited at a second frequency which is higher than the first frequency, and the first shorting conductive plate is arranged close to the feeding conductive plate such that the first shorting conductive plate is electromagnetically coupled to the feeding conductive plate.