Unidirectional microwave-only cloak -> omnidirectional visible light cloak?
It's gonna take a little more than "a few years".
The biggest problem I see from having done lots of RF engineering in the lower microwave range (mostly FCC part 97, but some telco work, aside from the wifi stuff that "everyone" does) is specs always improve, but the basic layouts / schematics / ideas don't change very much.
Higher freqs? Sure. A heck of a lot of orders of magnitude? Um, maybe, over the course of a lifetime and billions of bucks. Unidirectional to omni? Um no.
You can make a "better" horn antenna. You can do crazy stuff to eat the side
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