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The input impedance of a monopole antenna in a rectangular waveguide is investigated experimentally. It is found that theoretical results based on the assumption of a sinusoidal current distribution are in good agreement for monopole lengths up to about 0.6 of the guide height and about 1/4 λ0. For longer monopoles, a more accurate theory should be sought.
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M.J. Al-Hakkak (1969) studied this question.
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