Hello all! I am a student of electrical & electronic engineering, in my final year; for my dissertation, I am exploring the possibility of scavenging energy from a magnetic field in order to power a wireless sensor..I am using a coil of rectangular cross section with a magnetic core occupying the interior volume of the coil. However, due to the core being of permeability around 30000 (which i need, to maximise power) at the values the B-field is oscillating in, the inductive reactance rises incredibly much, (19mH * 30000) making the power highly reactive, with only a VERY small amount of real power going through the load (not mention matching the coil impedance with the load impedance, which is another problem I am facing). I am sure that out there, there are some power electronics that could solve my problem (what do transformers do when they have a high inductive reactance and output less real power?)...Would anyone know how to confront this problem? I had the idea of placing a capacitor in series with the coil, so that the inductive reactance is cancelled out by the capacitive reactance, but that would create a resonant circuit, and then we are on to other complications, right?? Thank you very much for taking the time!!