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On Mar 11, 10:29 am, Cecil Moore wrote:
Art Unwin wrote: If Kraus said "The radiation is perpendicular to the accelleration" then the book is worthless. Balanis says, speaking of an infinitesimal dipole: "Integrating the complex Poynting vector over a closed sphere, ... results in the power (real and imaginary) directed in the radial direction. Any transverse components of power density, ... will not be captured by the integration even though they are part of the overall power." Apparently, Kraus' assertion is a result of the integration math and does not necessarily correspond to reality. -- 73, Cecil http://www.w5dxp.com Another point to reckon with is the tilted folded dipole The experiment the Naval departgment under took when comparing antennas. The results showed that antennas tipped away from parallelism to the ground provided best results for their use which concentrated on receiving. All existing antennas were removed and replaced by tilted radiators. Thus their tests showed that tipped radiators was not a "myth" as stated by this group and also radiationis not primarily at right angles to a radiator.Is the Navy at fault by not conforming to Kraus's and other expert teachings and aligning themselves to facts attained in the field. As Reagan stated "Trust but verify" The same goes for students who suck up what the experts and professors state without verifying from first principles. Choice of answers will allow memorisation to pass the exam but not to arrive at the cusp of new discoveries! Art Unwin...KB9MZ..xg (uk) |
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