posted on Mar, 12 2023 @ 05:07 PM
a reply to:
anonentity
The band of radio frequencies used by Bluetooth is between 2.4 and 2.483Ghz.
The wavelengths of Bluetooth are, therefore, around about 125 mm long.
An efficient dipole antenna that either picks up, or transmits Bluetooth would have to be very close to 62.5 mm for one arm, and 62.5 mm for the
other.
Of course, there are 1/2 wave and 1/4 wave antennas, but they are far less efficient. The smaller you make the antenna with respect to the wavelength,
the less efficient it becomes.
Sub-millimeter antennas for Bluetooth would be totally useless, because the antenna needs to compare and detect the electrical difference of the two
phases (the positive going part, and the negative going part) of the radio wave.
If you tried to detect any potential difference of 125 mm wave with only a 1 mm or smaller antenna, there would not be a sufficient difference in
electrical potential between the 'ends' of the antenna for the electronics to detect it above the thermal 'noise' that all semiconducting junctions
produce at room (or body) temperature.
Also, MAC addresses are supposed to be unique. If you were to have a self assembling nano device, surely they would all be chemically identical, and
therefore have the same MAC address. There would be no way to ensure that each MAC address was unique, either, so its use as a unique identifier goes
away if it is not empirically unique. You also need some association to tag the MAC address as belonging to the person. So without databasing that
stores the association, the unique MAC address would not mean anything. It would be just a random number.
edit on 12/3/2023 by chr0naut because: (no reason given)