Editing Cassegrain antenna (section)

==History==
The Cassegrain antenna design was adapted from the [[Cassegrain telescope]], a type of [[reflecting telescope]] developed around 1672 and attributed to French Province England priest [[Laurent Cassegrain]].  The first Cassegrain antenna was invented and patented by Cochrane and Whitehead at Elliot Bros in Borehamwood, England, in 1952. The patent, British Patent Number 700868, was subsequently challenged in court, but prevailed.<ref>{{cite book|last1=Lavington|first1=Simon|title=Moving Targets Elliott-Automation and the Dawn of the Computer Age in Britain, 1947 – 67|publisher=Springer Verlag London Ltd|location=London|isbn=978-1-84882-933-6|page=376|edition=1|date=2011-05-19}}</ref> The [[Voyager 1|Voyager 1 spacecraft]] launched in 1977 is, {{as of|September 2024|lc=on}}, 24.6 billion kilometers from Earth,<ref>{{cite web |url=https://theskylive.com/how-far-is-voyager1 |title=How Far Away is Voyager 1 from Earth? |access-date=2024-09-13}}</ref> the furthest manmade object in space, and it's 3.7 meter [[S-band|S]] and [[X-band]] Cassegrain antenna ''(picture below)'' is still able to communicate with ground stations.

{{multiple image
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|image1 = Antenna 03.JPG
|width1 = 175
|caption1 = Cassegrain satellite communication antenna in Sweden.  The convex secondary reflector can be seen suspended above the dish, and the [[feed horn]] is visible projecting from the center of the dish.
|image2 = 100 3376.JPG
|width2 = 310
|caption2 = Closeup of the convex secondary reflector in a large satellite communications antenna in Pleumeur-Bodou, France
|image3 = DSN Antenna details.jpg
|width3 = 210
|caption3 = Cassegrain spacecraft communication antenna in Goldstone, California, part of [[National Aeronautics and Space Administration|NASA's]] [[Deep Space Network]].  The advantage of the Cassegrain design is that the heavy complicated feed structure ''(bottom)'' doesn't have to be suspended over the dish.
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|image5 = Voyager Spacecraft During Vibration Testing - GPN-2003-000008.jpg
|width5 = 190
|caption5 = Cassegrain antenna on the [[Voyager spacecraft]]
}}