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The Modified Quality Factor Method (MQFM) was revisited in this paper to measure electrically small antennas (ESAs) radiation efficiency. The method is used to measure the radiation efficiency for three ESAs of maximum electrical dimension λ/12 at frequencies 433 MHz, 868 MHz, and 2400 MHz using three Wheeler caps, each having the exact size of the radian sphere (λ/2π) at the considered antenna operating frequency. The measurement results show agreement with simulations.
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Jadid et al. (2024) studied this question.
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