I have a magnetic field that is being induced onto a power line by a transmitter, which is following the length of the power line to the receiver. The receiver communicates via a loosely coupled coil with the transmitter.
This artificially perceives the transmitter a significant distance away from the receiver. I suspect the AC-DC power supply line may be picking up some of this bringing it within enough distance of the receiver to be perceived.
The problem I am finding is that the copper lines running from the power supply to the receiver cannot be effectively shielded against this phenomena. I have tried graphite sheets ideal for the resonant frequency of the system, however that approach is flawed as the signal is being brought within proximity of the receiver.
What would be a solution to attenuate or reflect the flux lines away from the power cable leading into the receiver?
To explain the "phenomena" more technically, what is happening is the RF-field is inducing eddy currents in the non-ferrous metal, which induces a magnetic field opposite to the original field (aka Lenz effect). Of course only part of the field is reflected, so in theory I should be able to use a material with high magnetic permeability to attenuate the signal. I wish there was some sort of flexible graphite sleeve I could use which had a sufficient attenuation at 13.56 MHz.