One may wish to sample a signal that is known to be band-limited, but whose bandwidth is not known a priori . See also Nyquist sampling rate and aliased response . In computer graphics, the jagged artifact in a line or curve that results from drawing on a raster grid. Aliasing makes it harder for compilers to optimize code, as they may not understand all the ways in which a given memory location might be modified. Synonymous with the elevation angle.
Gravity always acts on the reflector in the same plane, thus simplifying design and reducing cost.
A physical structure that responds to radiation to produce an amplifiable electronic signal by means of one or more feeds . At any operating frequency, an antenna may have more than one receptor associated with each feed, e.g. responding to different polarizations. The antennas of some single dish telescopes are equipped with multi-feed arrays . In radio engineering, the ratio of the power transmitted by an antenna in a certain direction to that which would be transmitted in the same direction if all the power supplied to the antenna was radiated isotropically. The context usually removes any possibility of confusion with the engineering term.