Discussion
Why does a tuned magnetic loop have such a narrow bandwidth?
Answer: D
A high ratio of stored to dissipated energy is precisely a high quality factor, and a small efficient loop stores a great deal of energy and loses very little, so its bandwidth may be only a few kilohertz. Retuning is needed for every small frequency change, which is why remote capacitor drives are standard. Its radiation resistance is very small rather than large relative to the reactance, capacitor loss reduces the quality factor rather than raising it, and radiation occurs off resonance too, though feebly.
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