A mobile communication device including a ground plane and an antenna disposed on a dielectric substrate, the antenna comprising: a radiating metal portion providing a resonant path for the antenna to generate a first operating band and a second operating band, wherein the operating frequencies of the first operating band are lower than the operating frequencies of the second operating band; a coupling metal portion, the coupling metal portion and the radiating metal portion forming a first coupling portion, wherein the coupling metal portion is electrically connected to a source through a connecting metal strip and the coupling metal portion capacitively couples electromagnetic energy to the radiating metal portion through the first coupling portion; and an inductive shorting metal portion having a length no less than one-half the length of the radiating metal portion, wherein one end of the inductive shorting metal portion is electrically connected to the radiating metal portion, the other end of the inductive shorting metal portion is electrically connected to the ground plane, the inductive shorting metal portion includes a first fractional section, and a second fractional section, the first fractional section and the radiating metal portion forming a second coupling portion, and the second fractional second and the coupling metal portion forming a third coupling portion, wherein the length of the first fractional section is longer than one-fifth of the length of the radiating metal portion, the length of the radiating metal portion is less than one-sixth of the wavelength of the lowest operating frequency of the first operating band, and the length of the coupling metal portion is no less than one-third of the length of the radiating metal portion. a radiating metal portion providing a resonant path for the antenna to generate a first operating band and a second operating band, wherein the operating frequencies of the first operating band are lower than the operating frequencies of the second operating band; a coupling metal portion, the coupling metal portion and the radiating metal portion forming a first coupling portion, wherein the coupling metal portion is electrically connected to a source through a connecting metal strip and the coupling metal portion capacitively couples electromagnetic energy to the radiating metal portion through the first coupling portion; and an inductive shorting metal portion having a length no less than one-half the length of the radiating metal portion, wherein one end of the inductive shorting metal portion is electrically connected to the radiating metal portion, the other end of the inductive shorting metal portion is electrically connected to the ground plane, the inductive shorting metal portion includes a first fractional section, and a second fractional section, the first fractional section and the radiating metal portion forming a second coupling portion, and the second fractional second and the coupling metal portion forming a third coupling portion, wherein the length of the first fractional section is longer than one-fifth of the length of the radiating metal portion, the length of the radiating metal portion is less than one-sixth of the wavelength of the lowest operating frequency of the first operating band, and the length of the coupling metal portion is no less than one-third of the length of the radiating metal portion.