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#7
May 1st 06, 09:10 AM
posted to rec.radio.amateur.antenna
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Insulation diameter vs Impedance OR how to get 20dBi out of a short Dipole
However, I found I could reduce the size of a 40M antenna to nearly half by surrounding the entire radiator with a water jacket only 40cM thick. It has a good match, and loses roughly a quarter dB to the full size antenna. It remains to be seen if this is just another aberration, or is an actual solution. 73's Richard Clark, KB7QHC Surely it is your model that is an aberration. Did it include such things as the loss tangent of the dielectric and the effects of the resistivity of the liquid ? Di-electric loading is a valid concept, but it has to be done sensibly, and modelled even more carefully, taking ALL the effects of the di-electric into account. GIGO. Regards Jeff |
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