The question is whether it can be jammed...
Any electromagnetic signal can be jammed. From ELF to EHF - all you need is to transmit the corresponding signal to cancel the other one.
It's when you have multiple signals and their harmonics riding a carrier wave that jamming becomes more difficult.
I didn't think there was a natural source for millimeter wave radiation. The article kept mentioning passive millimeter wave processing, but never mentions the source of the radiation.
Im curious about the image of the cars. Is there an active source and what we are seeing is the millimeter reflection?
Peaking my interest here ...
Anyone with a physics background that can answer some questions here ?