Abstract
This paper discusses antenna downtilt concepts and performance in an actual operating cellular system, the relationship between antenna height, downtilt angle, and coverage radius is also discussed. Theoretical calculation and actual operating data collected from the cellular system are compared. We draw the two following conclusions. In modern urban propagation environments, the coverage area control by antenna downtilt is reduced in a cell with a radius less than 2 km under occasional high-rise distributed tall building environment. For field engineering, to some extent, it is difficult for the base station engineer to measure and adjust accurately the calculated downtilt angle in cellular field work, so a new method should be found.
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