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On Mar 7, 7:29 pm, Art Unwin wrote:
When he brought the question of Q into the picture he made the statement that small antennas are usually of a low impedance which is correct empirically with respect to existing designs but it is not exclusive when dealing with all radiators that can be made that comply with Maxwells laws. I take it your version is gifted and suffers not from a low Q... :/ As I have said before it is implicite in Maxwells laws that a efficient radiator can be any size shape or configuration as long as it complies with Maxwells law. Sure it can. Common knowledge. It's also common knowledge that the trick with building a small efficient antenna is not really the size of the radiator itself, it's actually getting power to that small radiator. In my case my small antenna can have any impedance value for equilibrium and it is quite easy to have a resistive impedance in the hundreds of ohms as well as minuit impedances. I conform to 50 ohms purely because of component availability. As another aside my small antennas have a much wider bandwidth than any other available! As previously noted, you have reinvented the air cooled dummy load. Your performance specs sure seem to mimic one anyway.. :/ As far as gain or energy transmitted that all depends on what frequencies get thru the bandpass filter and in no way directs out of pass energy to be be redirected to band pass status and augment energy transmitted. Stored energy has no relationship to Q in my mind since it goes around or circulates as with a tank circuit energy that lies within the pass bandof the tank circuit filter. To summate, my antenna design is considered small yet complies with Maxwells laws and yet does not have a narrow bandwidth or low impedance thus Chu's comments cannot be inclusive of all radiators. Best regards Art As far as the rest, my cat has mittens.. :/ BTW, you need to define "equilibrium". After several months you still are lagging at this task. MK |
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