Abstract: A broadband dual-frequency tablet antenna comprises a set of dipole antennas, a baseplate, and an inductive investing-piece, in which a positive and a negative pole of the antenna-set disposed on the baseplate are composed of cambered narrow straps, respectively; the pole length is set about ¼&lgr; (wavelength) of a low-frequency band while the space between poles is set about ¼&lgr; (wavelength) of a high-frequency band; and the construction including the antenna and the baseplate is entirely invested in the inductive investing-piece. During application, by adjusting the cambered shape of the poles respectively, width of the narrow straps, interval between the narrow straps, and cooperating with inductance of the investing-piece, the harmonic bandwidth of said antenna could be widened to hence obtain the broadband dual-frequency function of the tablet antenna.