Discussion
Why does a transmitting loop antenna use thick copper tubing rather than wire?
Answer: B
A magnetic loop's radiation resistance is a fraction of an ohm, so every milliohm of conductor loss matters and thick tubing with a large surface area is essential to reach even moderate efficiency. Circulating currents of tens of amperes are normal. Mechanical strength is a bonus, the resonant frequency is set by the tuning capacitor, and no direct current flows. It is the clearest case in antenna practice of a design driven entirely by loss resistance.
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