feederpattern

Feeder pattern refers to the radiation pattern produced by the feed network of an antenna array, independent of the element patterns. It describes how power is distributed among the array elements when excited by the feed network. The feeder pattern is typically expressed as a function of the excitation coefficients or phase shifts applied to each element by the feed network. In array antenna theory, the total radiation pattern is the product of the feeder pattern and the array factor (which accounts for the spatial distribution of elements) and the element pattern (which describes the radiation from each individual element). Feeder patterns are crucial in designing phased array antennas for applications like radar, satellite communications, and wireless communications, as they determine the beam steering capabilities and sidelobe levels of the array. Different feeding schemes produce distinct feeder patterns, including uniform amplitude distribution (producing a main lobe) and progressive phase shift (producing scanned beams). The optimization of feeder patterns is essential for minimizing sidelobes and maximizing beam efficiency in practical antenna systems.