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Cassegrain Antenna Development
On Apr 13, 2:08*am, Emanuele Colucci wrote:
Greetings, Emanuele Colucci W1GHZ has a website on amateur microwave stuff that might be useful (construction practices, etc.) If you have access to a university library or online equivalent, there was a set of articles in the IEEE Antennas and Propagation Magazine (not the transactions on A&P) a few years back covering design of various reflector antennas. The Cassegrain is popular for the reasons you give: low noise from behind the antenna, especially if the secondary reflector is underilluminated. And, it lets you put the electronics right at the feed without having to worry about putting them out at the prime focus. You might also look at the Gregorian or Dragonian configurations, which are offset feed schemes. The Allen Telescope Array is using a form of Gregorian. After that, it's mostly a matter of paper and pencil and working out the curvatures. The biggest challenge is in figuring out what the effect of your construction tolerances is. |
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