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#11
March 24th 06, 01:58 AM
posted to rec.radio.amateur.antenna
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Current through coils
Roy Lewallen wrote:
John Popelish wrote: . . . Of course, it can't. But a lumped LC network made of perfect, ideal components can be constructed that mimic the terminal conditions of the coil in question to any degree of accuracy desired. The caveat is that you may not explore much of a frequency range if you expect this idealized model to remain a good mimic. At another frequency, you have to rebuild it to copy the effects at that frequency. The broader the frequency range of such a model, the more complexity it must have. Yes, but you can use an arbitrarily large number of sections, each with a small amount of L and C, and mimic a transmission line to any desired degree, over any frequency range you want. And all with zero physical size in the theoretical case, and arbitrarily small physical size in the practical case. In the limit of an infinite number of sections of vanishingly small L and C each, you arrive at the general equations for a transmission line, valid at all frequencies. The point I'm trying to make is that you don't need any particular physical size or any particular length of wire to make something that behaves like a transmission line to any degree of accuracy. Oh. Then never mind. :-) |
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