- #1
shoestring
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I don't know much about antennas, but I've seen descriptions of the field around dipole antennas that make a difference between the "near field" and the "far field", where the far field is more or less a pure radiation field of photons traveling away from the source, and the near field more like an dipole field (which is not as easily characterized as a stream of photons). There's of course no clear boundary between the two, but a rough estimate of where the radiation field begins to dominate is a wavelength away from the source.
Because radiation from cell phones have wavelengths in the cm - dm range (though I'm not sure exactly what wavelengths are used) I wonder if there's a near field (that isn't a pure radiation field) around cell phones that perhaps should be taken into account when possible effects on humans are discussed.
I'm aware that possible health effects from cell phones is a controversial topic, but here I'm interested in the technical part of the issue, if there can be a noticeable near field, somewhat different in character from the radiation field, right outside a cell phone.
Thanks :-)
Because radiation from cell phones have wavelengths in the cm - dm range (though I'm not sure exactly what wavelengths are used) I wonder if there's a near field (that isn't a pure radiation field) around cell phones that perhaps should be taken into account when possible effects on humans are discussed.
I'm aware that possible health effects from cell phones is a controversial topic, but here I'm interested in the technical part of the issue, if there can be a noticeable near field, somewhat different in character from the radiation field, right outside a cell phone.
Thanks :-)