Originally Posted by realjd

The MMW band spans both K and Ka band. Do you have a source for it being a Ka band signal? I can't fund my source for it being K band, but I promise I didn't make it up Regardless, Ka band is the most common used for police radar guns, which again are a much higher output than the extremely clean, low power RF coming off of a MMW machine. so if you have health concerns about MMW, don't go near a cop with a radar gun.

As an engineer, I agree that there shouldn't be any health concerns with MMW. I usually go through MMW machines because personally, I'd rather someone see my junk than touch it. But I always, always refuse the backscatter machines.