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A parabolic antenna is an antenna that uses a parabolic reflector, a curved surface with the cross-sectional shape of a parabola, to direct the radio waves.The most common form is shaped like a dish and is popularly called a dish antenna or parabolic dish.n advantage of parabolic antennas is that most of the structure of the antenna (all of it except the feed antenna) is nonresonant, so it can function over a wide range of frequencies, that is a wide bandwidth.
arrive are extremely weak. A dish antenna is used to collect these weak satellite signals over a large area - the surface of the. dish. These signals are then focussed by the parabolic curvature of the dish, to the focal point. Even at the focal point, the satellite signals are only a few micro-watts.