Besides things in pointed out in the other replies, I think the main error in this mental model is assuming there's a category difference between radio and micr

Besides things in pointed out in the other replies, I think the main error in this mental model is assuming there's a category difference between radio and microwave. Microwave is just a term for a largish swath of the spectrum that encompasses millimeter wave, and lots of cell phone bands, and frequencies used in point-to-point microwave links, frequencies used by your microwave oven, wifi, etc.