Patent ID: 8373604

Claim:
A multiband mobile communication device having a ground plane and an antenna, wherein the antenna is disposed on a dielectric substrate, the antenna comprising: a monopole including a feeding end which is a feeding point of the antenna, with the monopole generating a first resonant mode of the antenna; a shorted radiating portion having one end as a shorting end electrically connected to the ground plane and another end left open, with the shorted radiating portion extending along the monopole and having a coupling gap to the monopole, with the shorted radiating portion generating a second resonant mode of the antenna by coupling excitation of the monopole; a first radiating branch having one end electrically connected to the shorted radiating portion and another end left open, with the first radiating branch extending toward the shorting end of the shorted radiating portion, with the shorted radiating portion located between the first radiating branch and the monopole, with the first radiating branch generating a third resonant mode, wherein the third resonant mode and the first resonant mode form a first operating band of the antenna; and a second radiating branch having one end electrically connected to the shorted radiating portion and another end left open, with the second radiating branch extending along the first radiating branch, with the first radiating branch located between the second radiating branch and the shorted radiating portion, with the second radiating branch generating a fourth resonant mode, wherein the fourth resonant mode and the second resonant mode form a second operating band of the antenna.