Donald below is a Antenna View of the current in the cone area for my Eznec Sigma 4 model.
Do you see such a current formation on the red line near the radial that represents current that looks like the pattern for a 1/2 wave radiator in this Eznec model? NO!
In the case of the pattern you posted it may be nothing more than a perspective at a bad angle for the still shot we are looking at. I've taken pictures of my antennas down the street a bit, so I could get the perspective for their height relationships, and the image turned out showing the antennas looking bowed or bent over and not vertical. We have to consider the optics that may be a play here.
It is not possible for a 1/4 wavelength element to produce a 1/2 wave current pattern and you should know that, and it does not take all these high tech words to describe.
Thanks for the effort Marconi however, you've already made it perfectly clear you don't have an explanation for what we see and consider it nothing more than an anomaly. I'm sorry but an attempt is being made to describe the theory behind how the Sigma works and when there are gaps in that theory I'll be pointing them out until someone does something like Bob did with the 4 wire test and actually makes sense of it.
As I said before, so far DB is the only one to dig into this aspect and he has already shown that a similar shaped pattern can be formed on a 1/4 wave radiator if there is more than one current and the sources are at opposite ends. It really is time to recognize there are two currents on the outside of the cone. One is CMC flowing back down the outside and they are confined from the field within.
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