I know with a yagi antenna that putting it next to metal will cause parasitic coupling and detune the antenna. Starlink using what is essentially aesa, does this negate the issue? If so I don't see how because even traditional phased arrays are susceptible to parasitic coupling. I ask this because traditional transmitting antenna systems you always want to keep them away from metal. However it seems to be the consensus that metal roofs do not effect starlink. If this is truly the case then why?
@piggo @omnipotens
well in that case I think it's not the absolute distance that matters, but distance divided by wavelength, right? So maybe to a 60GHz wave, the roof seems far enough?
Also if the antenna has its own reflector between it and the roof, wouldn't that make the roof completely invisible to the antenna?
@wolf480pl @piggo Well a yagi has a reflector too. The best guess is that ku band being up to 18 Ghz doesn't take much distance from the to escape the metal
@omnipotens @piggo doesn't it also use Ka and E bands?
:comfycoffeewoozy:
@icedquinn @omnipotens
does that exploit the holes in the cage, or would it work with solid metal as well?
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@icedquinn @omnipotens
there's no such thing as non-herzian waves
https://www.capturedlightning.com/frames/Non-Herzian_Waves.html
There are reactive / out-of-phase waves, but they can't transfer any energy (by receiving them you're turning them in-phase).
The most likely way of an EM wave getting through a metal plate is the metal plate not being a perfect conductor (duh, metal usually has non-zero resistance)
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@wolf480pl no but mounted on a metal roof
@omnipotens you mean a starlink antenna can be 100% covered by a metal roof and still work? wtf?