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"art" wrote
Looking thru various antenna pages on the web and I continually find reference to inductance CANCELLING capacitance. The operative word should be BALANCING and the difference is important. In all cases the capapicitor is still there and operative as is the inductance. One cannot say they are cancelled so they can be disregarded. etc etc __________ No matter what one calls it, equal inductive and capacitive reactance at the input terminals of an antenna system (eg, resonance) is important only in achieving the most efficient power transfer from a source connected to those input terminals having an impedance matching the remaining pure (non-reactive) resistance of the antenna system == Antenna system reactance neither absorbs source power nor radiates, whether such reactance is capacitive, inductive, or in "balance / equilibrium." == Only pure radiation resistance will do so, and that is set by the natural radiation resistance of the antenna conductor(s), which in turn is related to the mechanical and electrical configuration of the radiating structure, and the operating frequency. Setting up equal inductive and capacitive reactance values at the antenna system input terminals means that the real radiating structure of the antenna will receive the maximum power possible from a matched transmission line, which will maximize the fields that the system can produce from the net power available from the transmitter. RF |
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