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A variation on the Luneburg lens antenna is the hemispherical Luneburg lens antenna or Luneburg reflector antenna. This uses just one hemisphere of a Luneburg lens, with the cut surface of the sphere resting on a reflecting metal ground plane. The arrangement halves the weight of the lens, and the ground plane provides a convenient means of ...
E-plane plate lens antenna of the target tracking radar for the US Air Force Nike Ajax anti-aircraft missile, 1954 Dielectric lens/horn antenna in the Atacama Millimeter Array radio telescope. A lens antenna is a directional antenna that uses a shaped piece of microwave-transparent material to bend and focus microwaves by refraction, as an ...
The MQM-36 carried Luneburg lens radar enhancement devices in its wingtips that generated a radar signature of a larger aircraft. The radar reflectors (Luneburg lens) wasn't used by the US Navy as the air search radar interfered with the control signals. Thus the air search radar was not used.
The corner reflector is not the only efficient radar reflector design; other retroreflector designs have also seen use. Luneburg lens , for example, are used on the ADM-141 TALD . [ 4 ]
Optical telescopes can be classified by three primary optical designs (refractor, reflector, or catadioptric), by sub-designs of these types, by how they are constructed, or by the task they perform. They all have their different advantages and disadvantages and they are used in different areas of professional and amateur astronomy .
This is a list of large optical telescopes. For telescopes larger than 3 meters in aperture see List of largest optical reflecting telescopes . This list combines large or expensive reflecting telescopes from any era, as what constitutes famous reflector has changed over time.
The Arecibo radio telescope in 2019 A detailed view of the beam-steering mechanism. The triangular platform at the top was fixed, and the azimuth arm rotated beneath it. To the right was the Gregorian sub-reflector, and to the left was the remains of the 96-foot-long (29 m) line feed tuned to 430 MHz (destroyed by Hurricane Maria).
A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century by Isaac Newton as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic ...
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