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Do antennas radiate photons?
In article , I wrote:
If you want to see something that is off axis, you might be able to leverage this if each antenna is directional and blocks most energy from outside a main lobe narrow enough that, for small N at least, the antanna only picks up signals from one of the aliased angles and blocks the adjacent ones - kind of like an RF amp passband that allows a desired frequency through and not its image frequency. Actually, the angular spacing increases with N, so if the dish excludes alias images when aligned with the overall "optical axis" then it excludes them when aimed off axis as well. And I am assuming s w, or the formula gives no aliasing at all. George |
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