enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Parabolic reflector - Wikipedia

   en.wikipedia.org/wiki/Parabolic_reflector

   A parabolic (or paraboloid or paraboloidal) reflector (or dish or mirror) is a reflective surface used to collect or project energy such as light, sound, or radio waves. Its shape is part of a circular paraboloid , that is, the surface generated by a parabola revolving around its axis.

3. Luneburg lens - Wikipedia

   en.wikipedia.org/wiki/Luneburg_lens

   Apart from offset systems, dish antennas suffer from the feed and its supporting structure partially obscuring the main element (aperture blockage); in common with other refracting systems, the Luneburg lens antenna avoids this problem. A variation on the Luneburg lens antenna is the hemispherical Luneburg lens antenna or Luneburg reflector ...

4. Ruze's equation - Wikipedia

   en.wikipedia.org/wiki/Ruze's_Equation

   The equation was originally developed for parabolic reflector antennas, and later extended to phased arrays. The equation is named after John Ruze, who introduced the equation in a paper he wrote in 1952. [1] The equation states that the antenna's gain is inversely proportional to the exponential of the square of the RMS surface errors.

5. Cassegrain antenna - Wikipedia

   en.wikipedia.org/wiki/Cassegrain_antenna

   A beam waveguide antenna is a type of complicated Cassegrain antenna with a long radio wave path to allow the feed electronics to be located at ground level. It is used in very large steerable radio telescopes and satellite ground antennas, where the feed electronics are too complicated and bulky, or requires too much maintenance and alterations, to locate on the dish; for example those using ...

6. Parabolic antenna - Wikipedia

   en.wikipedia.org/wiki/Parabolic_antenna

   A typical parabolic antenna consists of a metal parabolic reflector with a small feed antenna suspended in front of the reflector at its focus, pointed back toward the reflector. [ 2 ] [ 3 ] The reflector is a metallic surface formed into a paraboloid of revolution and usually truncated in a circular rim that forms the diameter of the antenna ...

7. Focal cloud - Wikipedia

   en.wikipedia.org/wiki/Focal_cloud

   This includes parabolic antennas and lens-type reflective antennas of all kinds. The effect is analogous to the circle of confusion in photography. In a perfect lens or parabolic reflector, rays parallel to the device's axis striking the lens or reflector all pass through a single point, the focal point. In an imperfectly constructed lens or ...

8. Beauty dish - Wikipedia

   en.wikipedia.org/wiki/Beauty_dish

   A beauty dish is a photographic lighting device that uses a parabolic reflector to distribute light towards a focal point. The light created is between that of a direct flash and a softbox , giving the image a wrapped, contrasted look, which adds a more dramatic effect.

9. Reber Radio Telescope - Wikipedia

   en.wikipedia.org/wiki/Reber_Radio_Telescope

   It consists of a parabolic reflector composed of 72 radial rafters and covered in 26 gauge iron sheeting with a focal length of 20 feet (6.1 m). It is 31 feet 5 inches (9.58 m) in diameter and is mounted on arched rails positioned on railroad wheels, allowing its angle of elevation to be controlled.