Abstract
In the study of an autopilot system of a radio controlled airplane, it is considered very important to provide GPS for the position data of air plane which enable one to control out-of-sight flight. In this paper, we discuss about data communication link to transmit the GPS data to ground control station. Here, we introduce the 4 elements stack array antenna consist of the modified transmission line antenna for receiving antenna of the GPS data from the air plane. This antenna system provides omni-directional radiation pattern in the horizontal plane and narrow beam pattern in the vertical plane with high gain.
