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Contrary current flow within a radiator
On Jan 15, 3:48*pm, Jim Lux wrote:
Richard Fry wrote: On Jan 14, 12:07 am, Art Unwin wrote: It has not yet been proven that current does not flow thru the center of a radiator. Assuming that significant r-f current exists at the center of a radiating conductor, where does it go when it reaches the end of that conductor? Ahh.. the famous "boundary condition".. Say you've got a big bar 100 feet long and a foot in diameter, and you've induced a rf current along it by some means. *All those equations * with the Bessel functions tell you the magnitude and phase of the current in some infinitely thin slice in the middle. But, at the end, those equations don't hold. *Essentially, the "reverse current" flows radially across the end and forms part of the "forward current" on the surface. I doubt there is a good analytical solution of this. *There's probably some decent approximations (within 5% or something), but anyone who really cares is going to do a FEM analysis of some sort and solve the problem numerically. RF Hmmmm I think anybody with a education could apply vectors to a full wave RESONANT radiator with charge and applied current such that Newton's laws can be shown as being satisfied Why would anybody shy away from that since we know that there is no current/ charge flow on the inside so the vectors will balance. Is there any disagreement with that aproach. If so why? It WILL show agreement with the groups aproach with respect to zero current / charge flow in the center of a radiator which should make you all feel good. Art Art |
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