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antenna physics question
On Nov 29, 7:35*pm, Art Unwin wrote:
On Nov 29, 4:42*pm, K1TTT wrote: On Nov 28, 9:32*pm, Art Unwin wrote: I have been struggling with this for some time so maybe somebody can set me straight. We wind a flat plate spiral antenna and we get to a point where the center medium becomes saturated with flux. Now I add even more coils. What action does that precipitate? I would like to think that the Meissner effect *( perfect diamagnetism) then takes over and swamps the external magnetic field as with a superconductor ( ie opposite to that of a paramagnetic) The skin effect is thus removed allowing the current flow to the surface by allowing the atomic structure to relax, and add to the current already in place to allow fully efficient radiation as it now lies outside the confines of conductor resistance. This is my effort in determining what is it that drives the constant impedance attributes of a meander type array? Regards Art what is the 'medium' that gets saturated? As a furthur background to the question. I modelled a two coil spring to make a closed circuit. Running thru the swr vs frequency I find that when I get into the Ghz realm the anti resonance value migrates to 52 ohms with low reactance escursions. Later the resistance value drops to single digits and then fraction of ohms together with slight reactance escursions with R being less than the wire used. At the same time gain shot up to the high twenties in cyclic form but with the extremely low impedance. The current flow at the feed point was 100% surge quickly dropping to a constant 25% current flow .I then made a 5 wire tape very close wound pancake about 24" dia which I placed inside a bowl shield which was grounded. This provided a fairly constant impedance with what appears to the ear to be a doubling of more of gain against a quiet background. I have nothing else to add except the computer program does have a precipetous drop in impedance which sort of alignes with superconductors when it changes over to perfect diamagnetic, where skin factor of the conductor is removed allowing current flow outside the conductor as shown by its low impedance. The pancakes (stacked ) with short length compared to a linear solenoid are fed at the center where surge current is at its highest and where all *wires tape ends are electrically connected together to complete a closed mesh type tape. The same can be done with a 100 foot roll insect window mesh with the material backed by thin duct tape. Thus the point of the question, What propels the reverse swamping of the previously weak diamagnetic fields? Thanks for looking Art With the current leaving the conductor the two vectors for the most efficient elevation and thrust *( are vector with heliical spin) to the surface residing particles as shown by Gauss which also aligns with Maxwell. One thing I should mention is when the "surface" current flow begins the radiation pattern goes thru a 90 degree phase change( a connection to the EH driven antennas perhaps?) I am now re writing the program with the x and y coordinates interchanged to see if some clues come to light when f/b and gain figures change from the X to the Y axis Art |
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