Abstract
AbstractAs Earth stations for satellite communication become smaller, the problem of interference with existing communication links becomes more serious. This paper proposes a technique to apply cancelling sidelobes to suppress such interference. A detailed examination of the location of auxiliary antennas was made to realize favorable characteristics to suppress the interference over a wide bandwidth. For an analytic study, a uniformly excited circular aperture antenna was assumed. Its characteristics for different sizes were obtained numerically. First, a case of the known arrival direction of the interfering waves was considered where only two auxiliary antennas are needed. However, their placement must be determined exactly depending on the arrival direction of the interfering waves and the diameter of the main antenna. If the arrival direction of the interfering waves is unknown, five auxiliary antennas are needed to achieve a fairly favorable interference suppression. To decide the optimum location of the auxiliary antennas, a normal projection of the two properly chosen antennas in the arrival direction of the interfering waves is required to coincide as closely as those for two antennas used in the case of the known arrival direction.
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