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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.
Example is the 802.11 wireless networks. Directional antennas-transmit a signal in one direction only. Examples are a yagi antenna, or parabolic dish antenna, which receives satellite signals Patch antenna-semi directional antenna-it is horizontally wide bu7t vertically taller then a yagi.Used in cellular telephony.he difference between passive and active antennas is that passive antennas do not amplify the signal in any way. It can only radiate a signal with the same amount of energy that appears at the antenna connector, after any cable and connector losses.