There are billions of mobile phones all communicating with each other sending wireless signals across the globe. How does each signal know where to go exactly, and how are they not intercepted by other signals?
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Wireless transceivers use antennas, analog filtering, and digital signal processing to talk on the right frequencies. Sometimes the transceivers are point-to-point, and the antennas are aimed at each other. Sometimes like cellphones, it’s a point to multipoint system, when one side provides coverage to a certain area and the subscribers have an antenna that works in all directions.
The signals are part of the electromagnetic spectrum, where the power comes from the transmitting side.
Now a really good question is, what are EM waves and how do they travel through space? Ask your mom..
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