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On Sep 11, 11:47*am, Art Unwin wrote:
There has been some "talk" that the spherical radiation pattern shown via Poynting's vector is impossible or just a theoretical thing. etc etc Quoting from John Kraus' well-respected textbook "Antennas For All Applications," 3rd edition, page 74: "Although the isotropic source is convenient in theory, it is not a physically realizable type. Even the simplest antennas have directional properties, i.e., they radiate more energy is some directions than in others." The Poynting vector does not apply only to isotropic sources. Here is a link to a simple definition: http://www.britannica.com/EBchecked/...oynting-vector .. It doesn't have to describe a perfect sphere. And in fact for practical, physical antennas it never does so. FYI, Art, nowhere in that textbook does Kraus write anything about your equilibrium, tipping, Coriolis effect, or tank circuits, or their being germane to the proper understanding and/or functioning of antennas. RF |
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