Interesting idea. I seem to recall seeing a PA2OHH circuit that used a Faraday screen around a ferrite rod antenna to allow only magnetic field signals to pass.
I wonder what happens when you then apply regeneration to a ferrite rod antenna (or a small loop antenna) that is shielded with a Faraday screen? Regenerating a loop antenna is known to allow it to interact with a larger area of the EM field in space due to bending of the field lines (I probably posted a link to the NASA research paper elsewhere here on the forum). By regenerating a Faraday-shielded loop antenna, maybe we can make it more resistant to electric field disturbances in the extreme near field.
I recall having problems with hand capacitance on the control wires when I tried to make a remotely-controlled regenerative loop antenna with varactor tuning. Hand capacitance is an electric field effect. So maybe screening the loop antenna might help. But on the other hand, such screening would require a good ground connection, which kind of negates one of the benefits of a loop antenna (namely, that it is balanced and requires no ground). Attaching long control wires near the capacitively-tumed section of a loop antenna will always be a tricky business simply because there is inherently a significant electric field potential across the capacitor and in the surrounding space at that point in the loop.
Interesting idea. I seem to recall seeing a PA2OHH circuit that used a Faraday screen around a ferrite rod antenna to allow only magnetic field signals to pass.
https://www.qsl.net/pa2ohh/07fer.htm
I wonder what happens when you then apply regeneration to a ferrite rod antenna (or a small loop antenna) that is shielded with a Faraday screen? Regenerating a loop antenna is known to allow it to interact with a larger area of the EM field in space due to bending of the field lines (I probably posted a link to the NASA research paper elsewhere here on the forum). By regenerating a Faraday-shielded loop antenna, maybe we can make it more resistant to electric field disturbances in the extreme near field.
I recall having problems with hand capacitance on the control wires when I tried to make a remotely-controlled regenerative loop antenna with varactor tuning. Hand capacitance is an electric field effect. So maybe screening the loop antenna might help. But on the other hand, such screening would require a good ground connection, which kind of negates one of the benefits of a loop antenna (namely, that it is balanced and requires no ground). Attaching long control wires near the capacitively-tumed section of a loop antenna will always be a tricky business simply because there is inherently a significant electric field potential across the capacitor and in the surrounding space at that point in the loop.