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If the ohmic resistance of a half-wave dipole is 2 ohms, and the radiation resistance is 72 ohms, what is the antenna efficiency?
97.3%
Total resistance (Rt) = Radiation resistance (Rr) + Ohmic resistance (Rloss) = 72 Ω + 2 Ω = 74 Ω. Efficiency (η) = (Rr / Rt) × 100% = (72 Ω / 74 Ω) × 100% ≈ 0.9729 × 100% ≈ 97.3%.
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