why do antennas become more sensitive if we apply voltage to them?
In: Engineering
Antennas them self are not really affected by a DC voltage.
However there are some kind of antennas (called active antennas), which contain already some kind of amplifier which makes the signal stronger and the antenna more sensitive. Without applying a voltage that amplifier cannot work properly.
As a general rule, they do not. Can you share what you’ve read or seen that prompted you to ask this question?
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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