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.

Abstract: The present invention relates to a collinear antenna structure. The structure comprises a dipole antenna, a coil, and a set of stacked radiator, wherein the length of the dipole antenna is ½&lgr;, the ground end and the signal end of the dipole antenna are connected to a coaxial cable, the length of the cable line is less than ¼&lgr;, one end of the cable line is connected in series to the top of the signal end, wherein the stacked radiator comprising at least two parallel radiators in series, the length of each radiator is ½&lgr;, the distance between the two radiators is about 1.0 to 4.0 mm, one of the stacked radiator is axially connected in series to the other end of the coil, thus forming the structure of the antenna.

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.

Abstract: The present invention relates to a collinear antenna structure. The structure comprises a dipole antenna, a coil, and a set of stacked radiator, wherein the length of the dipole antenna is ½&lgr;, the ground end and the signal end of the dipole antenna are connected to a coaxial cable, the length of the cable line is less than ¼&lgr;, one end of the cable line is connected in series to the top of the signal end, wherein the stacked radiator comprising at least two parallel radiators in series, the length of each radiator is ½&lgr;, the distance between the two radiators is about 1.0 to 4.0 mm, one of the stacked radiator is axially connected in series to the other end of the coil, thus forming the structure of the antenna.