Study and design of tri-band monopole antenna fed by a coplanar waveguide

A monopole antenna fed by a coplanar waveguide (CPW) operating at triple-band is presented in the paper, in which the two different monopoles can be used to obtain triple-band. The first resonant frequency f₁ is controlled mainly by the length of the longer monopole. The second resonant frequency f₂ is mainly decided by the length of the shorter monopole. The third resonant frequency f₃ is controlled by the position of the meandered structure of the longer monopole. In order to improve the gain of the antenna, a rectangular patch is added on the left side of the ground plane. Simulation results show that the peak gain of the antenna is 3.93 dBi in the whole working bandwidth.