Discussion
Why does the Wheeler cap method work poorly for a highly efficient antenna?
Answer: D
If the loss resistance is a hundredth of the radiation resistance, the capped and uncapped readings differ by one per cent and the efficiency is the difference of two nearly equal numbers, which is a poorly conditioned measurement. A differential method works best when the difference is a substantial part of the whole. Cap size, radiation behaviour and frequency shift are practical issues rather than the fundamental limitation. Knowing when a method is well conditioned is part of choosing it.
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