3. Large antennas

3.1 Reflector antennas

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3.1.1 Issues

In the previous paragraphs, we saw antennas with low gains, and then of the order of twenty dB for horns with a large aperture. In a way, this is the limit that can be achieved with an elementary or source antenna. If you want to go beyond this limit, you need to change technology and use reflector optics or antenna arrays. This enables us to obtain fine beams, multiple beams, shaped beams, etc. Applications include satellite communications, radar and radio astronomy. The example...