Discussion
What is a Wheeler cap measurement used for?
Answer: B
Enclosing the antenna in a conducting cap suppresses radiation while leaving the ohmic losses unchanged, so comparing the input resistance with and without the cap separates the two. It is the classical way of measuring the efficiency of an electrically small antenna. Patterns cannot be measured inside a cap, resonance is found from the impedance sweep, and polarisation needs a far field measurement. Suppressing one loss mechanism to measure the other by difference is an elegant and widely applicable idea.
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