Patent ID: 6914565

Claim:
A dual band antenna comprising: a support substrate with a grounding conductor; a first radiating conductor plate arranged substantially parallel to the grounding conductor; a power-supplying conductor plate extending downwards from the first radiating conductor plate and adapted to be supplied with high frequency power of a first frequency at a bottom portion of the power-supplying conductive plate; a connecting conductor plate for connecting the first radiating conductor plate to the grounding conductor; and a second radiating conductor plate provided upright with respect to the grounding conductor, the second radiating conductor plate facing an underside of the first radiating conductor plate at a top portion of the second radiating conductor plate and adapted to be supplied, at a bottom portion of the second radiating conductor plate, with high frequency power of a second frequency that is higher than the first frequency, wherein the second radiating conductor plate is so constructed that a gap between the top portion of the second radiating conductor plate and the first radiating conductor plate can be changed.