Antenna Technology by Zana Lane

By Zana Lane

This booklet is an entire 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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Early radio telescopes Full-size replica of the first radio telescope, Jansky's dipole array now at the US National Radio Astronomy Observatory The first radio antenna used to identify an astronomical radio source was one built by Karl Guthe Jansky, an engineer with Bell Telephone Laboratories, in 1931. Jansky was assigned the job of identifying sources of static that might interfere with radio telephone service. 6 metres). It was mounted on a turntable that allowed it to rotate in any direction, earning it the name "Jansky's merry-go-round".

Beamwidth C-band Satellite dish, Bucharest, Romania The angular width of the beam radiated by high-gain antennas is measured by the halfpower beam width (HPBW), which is the angular separation between the points on the antenna radiation pattern at which the power drops to one-half (-3 dB) its maximum value. For parabolic antennas, the HPBW θ is given by: where k is a factor which depends on the shape of the reflector and the feed illumination pattern. For a "typical" parabolic antenna k = 70 when θ is in degrees.

Feature of these telescopes is that it is the world's largest planetary radars (except Suffa RT-70). A typical size of the single antenna of a radio telescope is 25 meters. Dozens of radio telescopes with comparable sizes are operated in radio observatories all over the world. China officially started construction of the world's largest single-aperture radio telescope in 2009, the FAST. The FAST, with a dish area as large as 30 football fields, will stand in a region of typical Karst depressions in Guizhou, and will be finished by 2013.

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