why do antennas become more sensitive if we apply voltage to them?
In: Engineering
Depends on the antenna, but some antennas use voltage to get the receiver in a better range. Basically the antenna receiver is reading voltage but with very little actual change in voltage. Maybe +/- 0.01v. The receiver can read most precisely at 5v so it puts a 5v reference signal on the antenna. It’s not a more precise antenna, it’s a more precise receiver.
Sometimes it’s also used for other things. The reference signal could help eliminate or cancel out static. Or it can be used to verify the presence of the antenna.
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