Patent ID: 6922172

Claim:
A broad-band antenna for mobile communication, characterized in that a carrier made of a dielectric is disposed on a circuit board provided with a grounding plate on substantially a whole surface, a metal plate having a suitable shape is provided on an upper surface of the carrier, a first and a second antenna elements functioning as inverted-F antennas respectively resonant at a first frequency band and a second frequency band higher than the former are formed by providing an earthing terminal for electrically connecting the metal plate to the grounding plate and a feed terminal for electrically connecting the metal plate to the circuit board, a third antenna element having a base end electrically connected to the feed terminal and resonant at a third frequency band of frequencies higher than the second frequency band is provided on a surface of the carrier, an end of the second antenna element and an end of the third antenna element are disposed to be spaced from each other by a distance of 0.1 wavelength or more of the third frequency band, and the end of the third antenna element is disposed to be spaced from the grounding plate by a distance of 0.01 wavelength or more of the third frequency band.