Parabolik reflektör antenlerin radyasyon karakteristikleri

The reflector antenna systems are widely used in telecommunication systems. They can be used to increase the number of users in the system. Parabolic antennas satisfy the requirements to expand the frequency reuse. These antennas are ideal for combating propagation problems and interference. In this study, a parabolic reflector was chosen for investigation since it produces low side lobes together with high gain pencil beams, and the performance of parabolic reflector antenna has been investigated. The radiation pattern, directivity as well as gain by varying the f/d and the diameter of the parabolic antenna were investigated. The results were obtained by using the Parabolic Reflector Dish Antenna Program which was written in the MATLAB programming language. The parabolic reflector antenna directivity and gain were calculated and the radiation patterns were plotted when f/d = 0.5, 0.6, 0.7, 0.8, and the antenna diameter d = 0.25 m, 0.5 m, 0.75 m, 1 m, 2 m, 3 m, and 6 m. The results show that the reflector antennas' directivities are related to f/d ratio. Directivity increases as f/d increases and optimum directivity occurs at f/d = 0.8. The value of directivity increases with increasing diameter. At d = 2 m the radiation pattern becomes boarder and electromagnetic wave propagation will be high.