The concept of antenna beam steering by variable surface impedance loading is investigated. It is shown, as an example, that if an electric dipole is mounted over a prolate spheroid with a variable surface impedance, then the radiated beam can be scanned considerably. This is achieved provided that the real part of the surface impedance can obtain both negative and positive values. The possible realization of such a scheme is briefly discussed.
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Alexopoulos et al. (1974) studied this question.
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