Dual-frequency strip-sleeve monopole for laptop computers

A novel dual-frequency strip-sleeve monopole antenna for use on a laptop computer is described. The antenna operates simultaneously in the 0.824-0.894 GHz and 1.85-1.99 GHz bands of the AMPS and the PCS systems with return-loss less than -9.5 dB. Effects of several antenna and computer parameters on the input impedance, radiation pattern, and directivity are given. The parameters considered include an angle between the keyboard and the screen, dielectric materials of the keyboard and the screen, number of parasitic antenna sleeves, and the dielectric covering the antenna.