ANTENNA FOR USE IN RADIO COMMUNICATIONS

摘要

An antenna structure for use in at least two different r.f. (radio frequency) operational frequency bands in a radio communication device, the antenna comprising (i) an elongate conducting radiator; (ii) a feedline including a signal conductor and, electrically connected to the elongate conducting radiator, a screening conductor; and (iii) a conducting member adjacent to a portion of the elongate conducting radiator and a portion of the feedline connected thereto, the conducting member providing an r.f. impedance between the feedline and the elongate conducting member; wherein the elongate conducting radiator provides a quarter wave monopole antenna in a first r.f. operational frequency band and a hall wave dipole antenna in a second r.f. operational frequency band. The feedline preferably comprises a coaxial connector. The conducting member preferably partly or fully encloses adjacent portions of the feedline and the elongate conducting radiator. The conducting member may comprise a curved plate or sleeve.