The reason that VLF antennas are built onto ferrite rods is because they need to fit into some human-scale space - but when you do that, you end up giving up a lot in performance. There are many ways to improve your writing skills. ferrite toroid calculator Provide multiple ways. On-line ferrite ring core inductor calculator. This means that it wastes less energy on heating itself up, and radiates more to the outside world (or does a better job of picking up external signals).įor VLF antennas, unless you're doing something heroic and possibly in violation of local airspace rules, bigger is always better. Calculating the Inductance of a Ferrite Rod-Cored Coil online. In general, up to at least a wavelength or so, the bigger an antenna is with respect to the wavelength of the RF you're generating, the better it couples to free space. The size (and more importantly the degree to which it leaks to free space) depends on the construction of the inductor. In the worst case, you'll get an inductor that's shielded or has a toroidal core and has very little leakage.ĭoesn't the size of the magnetic field depend entirely on the inductance of the coil, regardless of shape or size ? See results for P, F, R, T, and L materials by entering frequency, temperature, and peak flux density. In general you'll get an inductor closer to the ideal inductor than a purpose-built antenna (even one on a ferrite rod). Ferrite Core Loss Calculator The Magnetics Ferrite Core Loss Calculator is an easy way to find core loss data on Magnetics' Ferrites at various frequencies and temperatures. An ideal inductor radiates no energy - that would defeat the purpose of an antenna.Ĭan I just use a same value inductor as a replacement for my antenna ? Provided SRF and DC resistance are good enough for my use case.
What makes a ferrite antenna different from an inductor ?Īntennas work by electrically coupling to free space, to either radiate or receive energy - it's their whole purpose.
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