by on February 22, 2025
A resonant circuit can only have low damping (high Q, slim bandwidth) if it is a "closed" circuit, with no power dissipating components. 108-109 But such a circuit doesn't produce radio waves. A resonant circuit with an antenna radiating radio waves (an "open" tuned circuit) loses energy quickly, giving it high damping (low Q, wide bandwidth). There was a fundamental tradeoff between a circuit which produced persistent oscillations which had slender bandwidth, and one which radiated high power. ...
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