State Department and intelligence personnel have reported neurological symptoms since 2016 that have been attributed to a “directed microwave” weapon. The first reports were from State Department personnel in Havana, Cuba, and the symptoms have been named the Havana Syndrome.
No cause of this syndrome has been identified, but it has been attributed to the effects of a directed microwave weapon. But nobody has shown 1) that microwaves cause such symptoms or 2) that such a weapon exists, or what it might look like.
At one point in my career, I did some research that bears some similarities to the discussions that have been going on. So I wrote about that.
Cross-posted to Nuclear Diner