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Followon to image theory
David wrote:
With a vertical monopole antenna, the field emitted by the radials forms a near field and interacts with the wave radiated by the vertical element. Is it mainly in the vertical direction that the radial fields interact with the field from vertical element? I would expect the antenna feedpoint impedance to be formed from the length of antenna conductors and the interaction of the fields. If a monopole is simulated in a NEC program above a perfect ground plane, is it possible to see the reflection? I would expect NEC program to show reflection of waves from metallic surfaces e.g reflection from perfect ground plane or parabolic dish. Can a NEC program allow the user to see whether the wave is reflected (as for perfect ground plane) or whether effect is due to wave interaction (as for radials)? Can the user then vary a finite size ground plane to see whether antenna impedance comes from reflection or wave interaction? What do you mean when you say that waves interact with each other? Explain what you mean by the word "reflection." 73, Tom Donaly, KA6RUH |
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