By Zana Lane
This ebook is a whole package deal for wisdom sharing on Antenna know-how. desk of Contents bankruptcy 1 - Dipole Antenna bankruptcy 2 - Horn Antenna bankruptcy three - Radio Telescope bankruptcy four - Parabolic Antenna bankruptcy five - Antenna (Radio) bankruptcy 6 - tv Antenna bankruptcy 7 - Radio Masts and Towers bankruptcy eight - Omnidirectional Antenna & Directional Antenna
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This technique works by superposing (interfering) the signal waves from the different telescopes on the principle that waves that coincide with the same phase will add to each other while two waves that have opposite phases will cancel each other out. This creates a combined telescope that is equivalent in resolution (though not in sensitivity) to a single antenna whose diameter is equal to the spacing of the antennas furthest apart in the array. A high quality image requires a large number of different separations between telescopes.
Until then wireless radiating transmitting and receiving elements were known simply as aerials or terminals. Marconi's use of the word antenna (Italian for pole) would become a popular term for what today is uniformly known as the antenna. In common usage, the word antenna may refer broadly to an entire assembly including support structure, enclosure (if any), etc. in addition to the actual functional components. Especially at microwave frequencies, a receiving antenna may include not only the actual electrical antenna but an integrated preamplifier and/or mixer.
Parabolic antennas are distinguished by their shapes: Paraboloidal or dish - The reflector is shaped like a paraboloid. This is the most common type. It radiates a narrow pencil-shaped beam along the axis of the dish. o Shrouded dish - Sometimes a cylindrical metal shield is attached to the rim of the dish. The shroud shields the antenna from radiation from angles outside the main beam axis, reducing the sidelobes. It is sometimes used to prevent interference in terrestrial microwave links, where several antennas using the same frequency are located close together.