By Zana Lane
This booklet is an entire package deal for wisdom sharing on Antenna expertise. 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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Additional resources for Antenna Technology
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.
Large 177 ft. Hogg horn antenna at AT&T satellite communications facility in Andover, Maine, USA, used in 1960s to communicate with the first direct relay communications satellite, Telstar. Hogg microwave relay antennas on roof of AT&T telephone switching center, Seattle, Washington, USA Hogg antennas Hogg horn antenna A type of antenna that combines a horn with a parabolic reflector is the Hogg antenna, invented by D. C. Hogg at Bell labs around 1960. It consisted of a horn antenna with a reflector mounted in the mouth of the horn at a 45 degree angle so the radiated beam is at right angles to the horn axis.
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.