Abstract
In this paper, the FDTD method is applied to the stacked microstrip antenna. A single patch antenna has a low gain(5-8 dBi)and a narrow bandwidth. By stacking a parasitic element on a microstrip patch antenna, the antenna with high gain or wide bandwidth can be realized. These characteristics of stacked microstrip antenna depend on the distance between a fed element and a parasitic element. The input impedance, the directivity, and the near field distribution are calculated very accurately and the relation between the wideband and the gain enhancement and the calculated near field distributions of the stackd microstorip antennas are discussed.
