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but antennas have been miniaturized very well. (Frequencies have gotten somewhat higher, but it doesn't explain everything.)
by Gravityloss 13y ago
but antennas have been miniaturized very well. (Frequencies have gotten somewhat higher, but it doesn't explain everything.)
- greenyoda 13y agoAntennas aren't mechanical devices; they don't need to transfer mechanical energy to air molecules. Also, their size is constrained by the power they need to emit as well as the wavelength of the signal, so we aren't going to see a cell phone antenna that's on the same scale as a transistor in an integrated circuit (tens of nanometers). An antenna that can only put out a microwatt of power won't be able to hit a cell tower that's a couple of miles away.