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"Ionic Liquid" Antenna
On 9/7/2010 11:52 PM, Art Unwin wrote:
John, all non frequency dependent radiators have to be shielded as it plays havoc with the cancellation of reactance. But even with the quick lash up I made where I broke all the rules and even changed to "stacked pancakes" instead of coils inside coils it still would be ok for directional use in a loft for some of the bands. Either way the lash up did not totally destroy its attributes. I suppose it would be more impressive if I shielded it plus a reflector and put it on the tower but that was not the point I was trying to make which is the persistance in keeping non frequency dependentcy while maintaining a small volume. I modeled a ten turn coil inside another ten turn coil where both were joined together as a closed circuit and a overall diameter of 8 to 9 inches sitting on a perfect ground ala reflector When an antenna is not frequency dependent there is no skin depth resistance because of the Meissner effect so more current is applied to generating radiation. This conforming to Maxwell's law by not indulging in generating magnetic fields. Note Maxwell never added units of Tesla in his equation so why should you? By the way that model showed gain inbetween 20 and 30 db because of current bypassing the innards of the radiator and traveling on the surface. So the old timers were correct in saying more wire is better....as long as you decrease the resistance created by adding wire!!!!!! That way you have I sq R instead of I sq R + r which is efficiency in radiation to the maximum.by removing unnecessary losses. Simple concept eh? Regards Art Boy, he's getting there fast. I bet he's around for less than 3 weeks this time. Any takers? tom K0TAR |
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