Japan's NTT Docomo uses invisibility cloak tech to fix 5G reception Japanese mobile operator NTT Docomo has opened up on its endeavors to make sure 5G and successor wireless technology generations continue to function, despite humans – or perhaps the companies that employ them – insisting they work indoors. Windows and other elements of modern buildings are hostile to the high frequency radio …
Aerogel is pretty much the worlds greatest heat insulator, so at least the proposal has that going for it. Quite how it does in the visible spectrum I don't know - hopefully it's a bit more transmissive, or things are going to get pretty bleak. I have a roll of it in the shed, looks like a gray hairy carpet, but I believe it comes in other forms too.
Damon Hart-Davies did a very good write-up on Aerogel and his insulation use with it on this very site: https://www.theregister.com/2010/11/24/diy_insulation_with_aerogel/
He does mention windows as well, definitely worth a read.
Voyager trains as used by Cross Country have tinted windows that block mobile signals. A blessing for some an annoyance for others, ther is a better chance of reception in the vestibule.
They also stop working if the get too wet with sea water but that’s a different story.
And that's why this sort of thing is going to run headlong into building codes that require ever-more-aggressive Low-E coatings. Around these parts, it's no longer possible to build a code-compliant home that makes significant use of passive solar heating, for example, because the code standards were developed for warmer parts of the state.
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