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The beam width of the main beam is beta approximately equals to lambda over d. The circular reflector has a circularly symmetric pattern, whereas the pattern of the cylindrical reflector has a narrow beam in the azimuth plane corresponding to its long dimension. A wide beam in the elevation plane is corresponding to its narrow dimension. The peak of the main beam represents the highest level of field strength. The side lobes region represents a potential source of interference into the communication link, and for this region is generally required to be of low level. The diameter of the circularly symmetric antenna is d.