- #1
Jdo300
- 554
- 5
Hello All,
I have a question related to the understanding of how an active antenna works. From my *extremely limited* knowledge of the subject, I hear that an active antenna is able to receive a stronger signal from a transmitting source by transmitting a wave of the same frequency such that the EM waves of the active antenna cancel out the incoming waves? And that this action actually increases the effective apature (assuming I'm using the right word there) of the antenna.
If this is true, I want to know if one could create the same effect using a couple of coils in the following situation: For this example, I consider the case where I have one coil with an RF signal in it, and a second coil with a DC current flowing through it. What I would like to know is if the coil with the RF signal in it, can actualy absorb some of the magntic field energy from the DC coil as its magnetic field periodically cancels and un-cancels the DC coil's magnetic field (assuming that the field strengths are matched to allow this cancelation to happen.
I know this sounds like a weird question to ask but this is related to a thought experiment that I am working on. Any comments and/or criticisms welcome.
Thanks,
Jason O
I have a question related to the understanding of how an active antenna works. From my *extremely limited* knowledge of the subject, I hear that an active antenna is able to receive a stronger signal from a transmitting source by transmitting a wave of the same frequency such that the EM waves of the active antenna cancel out the incoming waves? And that this action actually increases the effective apature (assuming I'm using the right word there) of the antenna.
If this is true, I want to know if one could create the same effect using a couple of coils in the following situation: For this example, I consider the case where I have one coil with an RF signal in it, and a second coil with a DC current flowing through it. What I would like to know is if the coil with the RF signal in it, can actualy absorb some of the magntic field energy from the DC coil as its magnetic field periodically cancels and un-cancels the DC coil's magnetic field (assuming that the field strengths are matched to allow this cancelation to happen.
I know this sounds like a weird question to ask but this is related to a thought experiment that I am working on. Any comments and/or criticisms welcome.
Thanks,
Jason O