SHAPING OF CONTOURED-BEAM ANTENNA MAIN LOBE BY PROFILING OF REFLECTOR ANTENNA
Abstract
In satellite communication complexes, it is required to ensure a given level of the gain of the space antenna in a given serviced area. A lower level of gain beyond this area is also required. The boundary of the coverage area may have a complex shape that does not change during the operation of the communication system. To meet these requirements, reflector antennas with a profiled reflector are used. The law of profiling the reflector surface is described by smooth analytical functions. However, when forming a contour lobe with a more complex shape, the required phase distribution may have discontinuities during the transition through the period 2π. These gaps cannot be eliminated by smooth functions without distortion. In this case, the known approaches to profiling reflectors of reflector antennas do not allow obtaining a radiation pattern with a given quality. The goal of the work was constructing a reflector of a reflector antenna, which provides the formation of a radiation pattern with specified parameters. To achieve this goal, the following tasks have been solved: 1. Development of an algorithm for profiling the reflector of a reflector antenna, taking into account the shape of the boundary of the serviced area and taking into account the given law of distribution of the gain; 2. Conducting numerical simulations on the construction of the reflector profile. In the course of the research, an algorithm has been developed that allows you to obtain the reflector profile of a reflector antenna. This reflector antenna generates a field distribution at the aperture corresponding to the radiation pattern with the required parameters. To do this, the calculation of the field distribution on the plane was performed, and the surface of the reflector was synthesized based on the calculation results. Numerical simulations have confirmed the possibility of constructing a reflector antenna that forms a radiation pattern with specified parameters.
