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Can radio waves be focused to a point using a phased array?
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<blockquote data-quote="Christian" data-source="post: 739931"><p>I've seen many examples of ultrasonic phased arrays being used with non-linear phase relationship between elements to concentrate all the power at a specific point, for example:</p><p></p><p><a href="https://www.ndt.net/article/v07n05/rdtech/rdtech.htm">https://www.ndt.net/article/v07n05/rdtech/rdtech.htm</a></p><p></p><p>As I understand, this is different to how a typical RF phased array works, which takes advantage of linear phase differences between elements in order to steer the beam such that gain is highest in a desired direction, though without a focal point. However as far as I can tell the physics should be the same, so can an RF phased array be used to focus RF energy to a particular point in space? If so, does this mean that the gain for such a configuration then varies as a function of distance from the source (assuming constant direction from the source)?</p></blockquote><p></p>
[QUOTE="Christian, post: 739931"] I've seen many examples of ultrasonic phased arrays being used with non-linear phase relationship between elements to concentrate all the power at a specific point, for example: [URL]https://www.ndt.net/article/v07n05/rdtech/rdtech.htm[/URL] As I understand, this is different to how a typical RF phased array works, which takes advantage of linear phase differences between elements in order to steer the beam such that gain is highest in a desired direction, though without a focal point. However as far as I can tell the physics should be the same, so can an RF phased array be used to focus RF energy to a particular point in space? If so, does this mean that the gain for such a configuration then varies as a function of distance from the source (assuming constant direction from the source)? [/QUOTE]
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Can radio waves be focused to a point using a phased array?
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