The printed antenna fed by microstrip line is proposed and analyzed. The antenna consists of four slots in the ground plane of the microstrip line. The characteristics of printed antenna such as input impedance, S parameter and far field patters of radiation are obtained by using the finite difference time domain(FDTD)method. The problem space in the FDTD analysis is 63×157×350 cells with the cell dimension Δx=Δy=Δz=0.167mm. Time step is set at the courant condition. Characteristics of printed antenna for matching impedance are obtained for length of offset, spacing of slots and dielectric constant and are shown in figures. From the results this antenna is useful for the mobile and satellite communications.
